From the moment a woman learns about pregnancy, she begins to listen to her body every day, trying to catch the slightest changes and understand what is happening to her unborn baby. If we are talking about in vitro fertilization, then increased attention to our feelings begins even earlier. How is embryo developing by week? We list the most characteristic processes at all stages of its development in vitro and in utero.

Photo of embryo development by days after IVF

Stages of development of the embryo

Back in the 1960s, photographer Lennart Nilson, using a powerful lens, managed to take a photo of the development of the embryo by week. By and large, this process is the same both during natural conception, and if in vitro fertilization was used. Only the initial stages of intrauterine development differ. We list the main stages of embryo development by weeks after IVF:

First trimester

The first trimester is the most important in the formation of the embryo, since it is during this period that the laying of organs occurs.

Second trimester

14-15 weeks. Eyebrows and eyelashes appear, the baby can make facial movements, the musculoskeletal system is strengthened. The heartbeat is amplified so much that it can be heard using an obstetric stethoscope. The pancreas begins to produce insulin, the genitals change (for example, the prostate gland forms in boys).

16-19 weeks. Finger nails appear, sensory organs improve, ears begin to hear, and eyes begin to distinguish light. The size of the fetus increases so much that the mother feels his movements; the blood composition becomes more perfect.

20-25 weeks. During this period, coordination of movements improves; all women begin to feel the movements of the fetus. The bones are strengthened.

Third trimester

26-30 weeks. The formation of alveoli in the lungs, which produce the substance necessary for maintaining their shape (surfactant), is nearing completion. The kid actively reacts to loud sounds, can blink. The brain develops rapidly, fatty tissue begins to form, the skin gains elasticity. By this time, the child becomes practically viable.

30-38 weeks. The skin becomes smoother, the child gains weight, the work of internal organs is improved. Closer to the time of childbirth, the child changes position, turning his head down (not always, but in most cases).

Human fetal development

Fetal size chart

The weight and height of the fetus are some of the most important parameters that help determine how correctly its intrauterine development proceeds. Track these criteria, with some permissible errors, allows ultrasound, as well as standard measurements of the size of the uterus and abdominal circumference. The table below shows the average values \u200b\u200bthat the doctor focuses on when assessing fetal development.

The duration of pregnancy is 40 weeks. The process of fetal development is divided by week, month, trimester. For a more complete picture of the bearing of a child, a woman can familiarize herself with the description below.

Fetal development by week of pregnancy: 1 trimester 1-13 week of pregnancy

Obstetric and fetal periods are distinguished:

The beginning of the 9-month period is the time during which the male and female cells merge, the embryo forms, and internal organs and systems begin to develop.

1 Week

It is characterized by the process of the emergence of a new life, the preparation of the cavity of the genital organ for attachment of the embryo.

Occurs:

1. The fusion of the egg and sperm.
2. The beginning of the active process of cell division, the formation of blastocytes - a hollow ball created from the formed membranes.
3. The laying of genetic characteristics.
4. Starting the process of production of chorionic gonadotropin - the hormone of pregnancy, the concentration of which allows you to establish conception using test strips.
5. The development of a new layer of the epithelium, the preparation of the reproductive organ for the adoption of the embryo.

At the 1st week, the expectant mother cannot notice signs of pregnancy, does not know about the conception that has occurred.

2nd week

A fertilized egg attaches to the uterine cavity. An embryo is formed that receives nutrients from the mother's body. In the process of ultrasound diagnostics, a specialist diagnoses pregnancy with certainty.

Child development:

1. The fetus, which has reached a size of 2 mm, adheres to the genital organ.
2. A protective membrane appears surrounding the embryo.
3. The process of formation of the brain, spinal cord, and circulatory system begins.

In a woman:

• Sudden mood swings occur, possibly a sharp appearance of migraine.
• Gustatory preferences change. There is an aversion to certain odors.
• Progesterone is produced intensely, which leads to increased sensitivity, discoloration of the nipple halos.
• Periodically, cramps in the lower abdomen, transparent, brown discharge from the vagina, without impurity of blood. This process accompanies the rupture of the follicle.

3rd week

There is a danger of fetal rejection caused by the rejection of a foreign body by white blood cells. Perhaps the occurrence of early toxicosis caused by the confrontation of the body's protective bodies of the proteins of the embryo. The size of the fruit is 2.5 mm.

Child development:

1. The circulatory system, brain and spinal cord are actively formed.
2. The beginnings of the respiratory system appear. The facial features of the unborn baby are determined.
3. Establishes a child’s connection with the mother’s body. There is a placenta.
4. A protective protein is actively developed that is designed to protect the fetus from the aggressive effects of the mother's immune system.

The expectant mother is worried:

• Sudden mood swings caused by hormonal disruption.
• A constant feeling of drowsiness, not passing after a good rest.
• 70% of women have spotting spotting from the genitals caused by implantation of the embryo, mistaken for the onset of menstrual bleeding.

4th week

Official confirmation of pregnancy by a doctor after a lack of monthly bleeding.

In addition to the main symptom, a young mother feels:

• The first symptoms of toxicosis.
• Sharp mood swings.
• Changes in taste preferences. Intolerance to any odors, even subtle.
• Great thirst.
• Permanent lack of sleep.

The baby at this stage occurs:

1. Formation of germ layers: endoderm - the basis of future internal organs; ectoderm - soil for the development of the nervous system; mesoderm - a layer responsible for cat tissue, the skeleton.
2. Development and formation of the respiratory, digestive system, cerebral bladders.
3. The appearance of a pulsating tube, later degenerating into the heart muscle.
4. The emergence of primordial limbs.

5th week

It is characterized by the appearance of obvious signs of pregnancy, the preparation of the body for bearing a baby. Test strips, gynecologist examination with 100% certainty diagnose conception.

  Characteristic of the child:

1. The embryo reaches a size of 4-7 cm. In length, 3.5 g. weight. It has a cylindrical shape, with the primordia of the extremities, fingers.
2. The first vessels are formed, on the 22nd day from the moment of fertilization, the heart contracts for the first time.
3. The foundations of the kidneys, abdominal organs are laid.
4. The fetus is separated from the chorion. Cells responsible for the growth of the genitals appear in the yolk sac.

At the end of the first month of pregnancy, a young mother:

• Tormented by toxicosis, intolerance to odors, tastes.
• The uterus increases in size, causing frequent urination, pulling cramps in the lower abdomen.
• The body temperature of a pregnant woman rises to 37.3-37.5 ° C.
• There is a change in the amount of estrogen and progesterone in the blood.
• The number of chorionic gonadotropin increases.

6th week

At this time, registration is registered in the antenatal clinic, a clinical diagnostic study of blood, urine, and bacalysis. It is possible to conduct an ultrasound to confirm pregnancy, study the development of the baby.

Fetus:

1. The child resembles a tadpole, with a large head and a long tail. Length - 4-6 mm. Constantly actively moving.
2. The heart muscle performs up to 120 beats per minute. (2 more than an adult).
3. The neural tube closes.
4. The brain, cranium is actively developing.
5. The placenta reaches a weight of 800 g. The amount of amniotic fluid increases.
6. Facial features are formed (chin, cheeks, lips, nose). The development of internal organs continues.

Feelings of a young mother:

• Toxicosis intensifies. Vomiting may occur in an unidentified clock. Refusal of food provokes weight loss.
• The woman is accompanied by a constant feeling of tiredness. The vessels of the brain overstrain, causing migraines, dizziness, and loss of consciousness.
• There are problems with the digestive system, the occurrence of constipation, diarrhea, bloating.
• The growth of the genital organ is accompanied by spasms of the abdomen and lower back. Gradually worsening pain, in the evening, spotting can indicate the risk of spontaneous abortion.

7th week

The middle of the first trimester of pregnancy.

Child development:

1. The length of the fetus is from 8-13 mm. The size of the head increases. The baby's brain is divided into 5 brain bubbles, the neural tube connects to the internal organs with the help of nerve fibers. The placenta thickens. The placental blood flow is fully adjusted.
2. The face takes on an exact shape. The eyes are designated, the formation of optic nerves and retina begins.
3. From the gastrointestinal tract, the stomach, pharynx, esophagus, rectum, and the base of the bladder are formed. Improving the liver, pancreas.
4. The respiratory organs are represented by the trachea, the primordium of the bronchi.
5. There is a spinal column, the neck is extended, the hands take the form of shovels.

Well-being of the woman:

• The week is characterized by enhanced hormonal changes, causing failure in the process of biochemical reactions, exacerbation of chronic pathologies.
• Weight loss of 1-3 kg is possible due to refusal of food due to toxicosis.
• Irritability intensifies, taste preferences uncharacteristic for a normal state appear.
• The number of vaginal discharge of a creamy shade increases. There is a risk of miscarriage. It is necessary to monitor the shade of leucorrhoea, cramping.
• The skin is covered with acne, acne. It may cause irritation, itching, redness in the abdomen and chest, caused by stretching of the skin tissue.

8th week

Pregnancy lasts about 2 months.

Baby changes:

1. The fetus acquires a human form 3-4 cm long. The back is leveled, the spine develops, the tail disappears. Hands and feet appear, facial features are visible.
2. The heart, bronchi are fully formed, the trachea in the stomach produces gastric juice, the intestines increase.
3. The brain is growing. The foundation of the lung tissue is laid.

In a pregnant woman:

• A rounded tummy of a small size appears. The first weight gain is felt due to the growth of protective adipose tissue.
• Facial skin is cleansed, hair condition improves.
• Concerned about spasmodic pain in the lower abdomen and back. Allocations are white, the appearance of blood is dangerous and may indicate a miscarriage beginning.
• The uterus increases in size, there is pressure on the internal organs. In the morning, nausea is most often worried, in the evening there is heartburn.

9th week

Kid:

Future mom:

• There is an increase in weight, increasing hunger. The daily rate of food intake is increased by ¼ part.
• Feels very tired, nightmares may occur. There is heaviness in the legs, shortness of breath appears.
• Feels frequent gagging, tooth problems. The baby draws nutrients from the mother’s body.

The uterine cavity is growing rapidly, the walls of the organ thicken. Increases pressure on internal organs. It is possible to increase body temperature to 37.5 degrees.

10th week

A new phase of pregnancy. By this period, the baby's body is fully formed, has limbs. The fetus reaches a height of 8-9 cm., Actively swims in the amniotic fluid, has a finished face, with the makings of the auricles. Eyelashes, eyebrows begin to form. Reflexes develop.

The child constantly sucks a finger, reacts to a change in situation, distinguishes between day and night time. The heartbeat reaches 100 beats / min.

The condition of a young mother worsens due to:

• Cramping in the lower abdomen, lower back.
• Shortness of breath, heartburn. Thrombocytosis, stretch marks on the chest, legs, and stomach are possible.
• Insomnia, nightmares. A conscious fear of losing a child appears.
• Enhanced growth of the uterus, occupying the entire canvas of the small pelvis. Disappearances of the waist, growth of the abdomen, pain, engorgement of the mammary glands.

11th week

The beginning of the 2nd trimester is “fruit formation”.

Child's condition:

1. Height is 9-10 cm. The baby is actively moving, feels comfortable in the uterine cavity. The head occupies ½ part of the body, eyes are open, hands are moving, fists are clenched.
2. Reflexes are improving.
3. The respiratory system fully develops, the intestines begin to work.

Maternal organism:

• Gains weight. The stomach is clearly visible, changes in the figure begin.
• Breast increases by 2 sizes, nipples become very sensitive.
• Stretch marks appear, veins enlarge.
• The uterus compresses the blood arteries, causing a lack of oxygen, dizziness, headaches.
• Toxicosis disappears.

12 week

The time of the 2nd scheduled ultrasound diagnosis, 1st screening for the amount of hCG in the blood. The fetus is in constant motion. It clearly distinguishes the time of day, feels cold, warm. Sucks a finger, drinks amniotic fluid.

Fully formed:

• the brain (will continue to develop actively);
• the thyroid gland works in full, triggering metabolic processes;
• external form of the genitals;
• gastrointestinal tract system.

Nails and body hair appear, and bone tissue forming the skeleton accumulates. The mental state of a young woman is normalized. Gains weight, the stomach grows a little. Often there is a urge to urinate. The number of vaginal discharge increases. Great risk of bacterial candidiasis.

13th week

The final stage of the first trimester. The body, vital organs of the child complete the formation.

  Toddler in this period:

1. It has a size of up to 14 cm in length, weight 70-80 gr. Swims, sucks a finger. Reacts to external stimuli, the emotional state of the mother.
2. The skeleton begins to appear, the internal genital organs.
3. The process of producing insulin starts.

Young mother feels:

• Constant pain caused by a sharp increase in the uterus. The likelihood of the formation of stretch marks.
• A burning sensation in the vagina is a symptom of candidiasis infection.
• Shortness of breath, manifested after physical exertion.
• Toothache caused by leaching of calcium from the body.

2 trimester: 14 - 27 weeks of pregnancy

How the fetus develops over the weeks of pregnancy in the second trimester depends on the health status of the expectant mother. In this period, bone tissue is formed, the baby is fed at the expense of the resources of the mother's body.

14th week

The woman’s body adapted to motherhood. Starts the process of protecting the nascent life. The expectant mother feels an improvement in overall health, a normalization of her mental state, and a decrease in irritability. Increased hunger makes you increase your daily diet by ½. The uterus extends beyond the small pelvis. Shortness of breath appears, heaviness in the legs.

The child has a size of 11-11.5 cm. Trying to smile, turns his head, squeezes his hands, moves his legs. Facial features are almost completely formed, clear reflexes.

In full begin to work:

• spleen;
• liver;
• pancreas.

The respiratory system starts. Heartbeat up to 110 bpm.

15th week

The beginning of the 5th month of pregnancy is accompanied by the passage of the 3rd blood test to determine the amount of hormones estriol, AFP, and hCG. Based on the results of studies, it is concluded that the fetus is prone to DNA pathologies.

Over the course of this week, a woman has:

Child development:

1. The fruit is covered with transparent skin of a reddish hue, growth up to 18 cm, weight 200 g. He constantly swims, moves his limbs, and responds well to external stimuli. In addition to the placenta, the baby is protected by a lubricant resembling molten margarine.
2. The development of the skeleton continues.
3. The immune system enters the stage of formation, interferon, immunoglobulin begins to be produced.
4. The organs of the digestive tract work in full, the genitals are developing.

16th week

The height of the baby is up to 19 cm, motor activity is increased, the child knows how to yawn, tumble, stretch. It responds well to external stimuli, distinguishes voices, loud music. Heart rate from 120-140 beats / min. The intestine is able to complete bowel movements. The endocrine system is fully formed, prepared for the start of work.

Young mother feels the movement of the child. In the daytime, small bumps are observed on the abdomen caused by bumps of small legs and arms. The uterus presses strongly on the bladder, causing frequent urination.

When restraining the urge to the toilet increases the likelihood of developing cystitis. The hemoglobin level is low.

Fainting, headaches, dizziness caused by a lack of oxygen in the vessels are dangerous.

17th week

The 19th obstetric week, half a 9-month period.

It is characterized by:

The condition of a woman is determined by:

• Weight gain.
• A change in body structure. The pelvis increases in size, the stomach is quite large.
• A constant feeling of hunger.
• Lack of oxygen in the blood. An increase in white blood cell count.

18th week

The size of the child is from 25 to 27 cm. The baby is moving. The respiratory system is formed, but does not work. Nutrients are delivered through the umbilical cord. The ear bones begin to develop.

For a young mother, this period is accompanied by:

• Severe pain in the internal organs, provoked by an increase in the uterus, a shift in the digestive tract. Heartburn appears.
• Increased hunger, thirst.
• A comfortable sleep in the supine position.

19th week

Expectant mother feels good. Weight increases by 4-7 kg from the original figures. Breast swells, excreted colostrum. The child reaches a height of 27 cm, weight 370 g. Gradually adds weight, improves internal organs. May determine taste and smell. The volume of bone and muscle tissue is increasing.

20th week

The pregnant woman clearly senses the fetal movement. A grown uterus compresses the respiratory system, provokes shortness of breath, tachycardia. The navel begins to protrude.
The ratio of the size of the fetus and the placenta changes in the direction of the growth of the child. The cerebral cortex, the nervous system is determined. Internal organs are formed.

21st week

The uterus squeezes the diaphragm, making it difficult for the young mother to breathe. Gait changes due to the displacement of the center of gravity. Leg cramps appear, caused by pinching blood flow.

The height of the child is 30 cm, weight 500 g. The fetus moves, trying to take a comfortable pose. The ears take on an anatomical shape. The kid reacts to the calm voice of his mother, recognizes him. Actively work internal organs and systems. The formation of nerve tissue is completed.

22nd week

Late toxicosis may begin to bother a young mother.  After eating, there is heartburn, pain in the abdomen. Uterine growth slows down, fetal volumes increase. The appearance of a strong sexual desire is possible.

The child is gaining weight (more than 500 g), is actively moving, anxious. It can feel all organs, parts of the body. The amount of hair on the head increases, eyebrows grow. Surfactant is produced, a substance that triggers the respiratory system after birth.

22 week of pregnancy: what happens to the baby and mother:

23rd week

The condition of the woman is satisfactory.

Characteristic features of the period:

• strengthened thrush;
• the appearance of false contractions;
• distinct stirring of the baby;
• persistent respite caused by increased weight.

The kid builds up subcutaneous fat. The skin becomes a red tint, hangs a little. The brain completes the formation, coordination of movement improves. The baby is moving. The growth of the fetus is 34 cm, weight 1 kg.

24th week

Pregnant well-being is stable. Headaches, dizziness, fatigue may disturb. The uterus is located 3-4 cm above the navel. Eyes become heightened sensitive.

The child reaches a height of 34-35 cm, weight 1 kg. The set of subcutaneous fat continues. Moves limbs, pulls the umbilical cord. Actively swim and somersaults can no longer. Ends the development of the brain. The meanders deepen, character traits, temperament are formed.

25th week

The woman worsens heartburn, pain after eating, vaginal discharge, uterine pressure. The hemoglobin level decreases. At least 1 time in 2-3 days, false contractions appear

The child grows in size, cannot swim, tumble, pulls limbs. All organs and systems are formed. It is easy to determine the gender of the baby. This week, the testicles descend into the scrotum in boys, the vagina appears in girls. Heart rate - 120 beats / min.

26th week

The baby’s organs are fully formed, with premature birth, the baby can survive if necessary care. The brain is improving, the immune system is developing. In the intestine, meconium is formed - the first stool of a person. Fetal growth 34 cm, weight 750 g.

The health of the young mother is satisfactory. Weight is constantly increasing, in the evenings heartburn torments. Headaches, dizziness became more frequent. The stirring of the baby is clearly felt.

27th week

The fruit reaches a size of 34-35 cm, weight 800 kg. Growth hormone will be produced. Stirring, gesturing of the baby is becoming more frequent. The immune system is formed.
  The woman’s belly increases every week. Constantly accompanied by a feeling of fatigue. Edema appears, possibly varicose veins.

3 trimester: 28 - 36 weeks of pregnancy

How the fetus develops over the weeks of pregnancy during the 3rd trimester is determined during a weekly visit to the gynecologist. By the beginning of this period, the baby is fully formed, is able to survive in the event of premature birth.

Week 28

The weight of the fetus is 1.2-1.3 kg, continues to gradually increase. The kid opens his eyes, turns his head to the sound, distinguishes between loved ones. Constantly hiccups. He can no longer swim freely, now he rests his head on the ribs of a woman.

A young mother becomes clumsy, awkward, tormented by forgetfulness. The uterus grows (3-5 cm above the navel), strongly compresses the internal organs, causing pain, a feeling of heartburn. Edema appears, especially in the hot season.

29th week

For a woman, the time period begins with discomfort, concern:

• shortness of breath, lack of oxygen;
• swelling, heaviness in the legs;
• heartburn,
• exacerbated chronic pathologies;
• dizziness intensifies in stuffy rooms.

The baby's movements are clearly audible (up to 10 times per hour).

The child's skin is smoothed, wrinkles appear on the limbs. Begin to function:

• adrenal glands;
• body temperature regulator.

The hairy veil grows, facial features are sharpened. Height up to 40 cm, weight up to 1.5 g.

30th week

By this time, a woman should add from 8 to 10 kg. The uterus is located 2-4 cm above the navel.
  The movements of the child can be unpleasant. The kid reached a height of 40-42 kg, weighs 1.7 kg. He is trying to occupy the final position in which he will remain until the moment of birth. Constantly frowns, expresses discontent and joy.

31st week

The child is fully formed, the skin is smoothed, blood streaks disappear. The gall bladder produces bile, the liver cleanses the blood. The lungs are closed, but an attempt is made to inhale independently. The weight of the fetus is more than 2 kg, height 40-42 cm.

Young mother feels strong shocks. It is difficult for her to climb the stairs. Tachycardia, varicose veins, constipation appear, the temperature regime of the body is poorly regulated. Dyspnea, swelling, heartburn intensifies. The movement of the baby may be accompanied by pain in the internal organs.

32nd week

During this period, a control ultrasound diagnosis with dopplerography is performed.

The dangerous time for the child has passed. A baby born at this time is completely viable. He has formed internal organs and systems. Only the lungs that start their birth field do not work.

33rd week

Weight is rapidly gaining in the child and the expectant mother. A woman is troubled by shortness of breath, heartburn. It is hard to walk (the uterus with the fetus squeezes the veins and arteries). Headache intensifies, it is difficult to sleep. The baby is almost ready for birth, immunity is strengthened.

34th week

The fetus weighs 2.5 kg, length from 40-42 cm. Improved nervous, respiratory, immune systems.
  The uterus is located 5-7 cm above the navel. The woman feels false contractions, skin itching in the abdomen.

35th week

In this time period, the baby's movements are intensely felt, the stomach takes a diverse form.
The fetus occupies the final position, upside down to the birth canal. The height of the baby is 47-48 cm, weight 2.5 kg.

36 - 37 weeks of gestation

How the fetus develops over the weeks of pregnancy and in the last days before birth is examined during medical examinations of the expectant mother. At this time, the child is completely ready for birth, viable without the use of medical manipulations.

36th week.The fetus accumulates subcutaneous fat. Constantly improving sucking reflexes. In the maternal body, hormonal changes occur - oxytocin, prostaglandins are produced. The total weight of the woman has grown by 11-13 kg since registration.

37th week.Pregnant women are worried about the precursors of childbirth:

• the bottom of the uterus falls;
• preparatory contractions intensify;
• body weight decreases.

The child grew up to 46-47 cm, weight from 2.7 kg. Ready for birth. Improves coordination of finger movements. The fluff covering the fetal body disappears.

38-40 weeks of gestation

The development of the fetus at 38-40 weeks of pregnancy consists in the constant accumulation of subcutaneous fat at the time of birth. At this time, the pregnancy is considered to be completely full-term, the child has formed.

The expectant mother is likely to experience symptoms that portend the onset of labor:

After the appearance, the doctors cleanse the baby, measure it, evaluate its condition and pass it on to the mother for the first feeding.

41-42 weeks of gestation

How the fetus develops by weeks of pregnancy in the event of a transition of time is determined by a specialist during an urgent ultrasound diagnosis, dopplerography.

Delay in labor activity up to 41-42 weeks is possible in case of incorrect obstetric calculations.  The fetus is fully formed, viable, ready for birth. If the gestation period is exceeded (up to 42 weeks), the woman is injected with labor stimulants. Further delay is fraught with coarsening of the skull, the risk of birth injury.

How the fetus develops by weeks of pregnancy: critical periods.

Fetal development is a complex philological process that lasts for 40 weeks.

Pregnancy is the normal state of a woman during which internal organs, systems, the body and skeleton of a small person are formed from a cluster of cells.

Article design: Svetlana Ovsyanikova

Video on the topic: how the fetus develops by week of pregnancy

How does the fetus develop by weeks of pregnancy:

Fetal development at 11 weeks of gestation:

The female body is a holistic system in which all the necessary resources for the successful bearing of a child are laid. It will be useful for those who are planning a pregnancy in the near future, and those who are trying to avoid this, to learn in detail how the process of conception of a child by day occurs and how many days it lasts. The sacrament of conception is the same, only its beginning directly depends on the individual characteristics of the woman.

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Ovulation day

By ovulation is meant the process of leaving the ovum of the formed egg, it is completely ready for the start of fertilization. A female cage can maintain its readiness for conception only in the period from 12 to 36 hours. It is for this reason that the most comfortable time for conception is the middle of the menstrual cycle, then the act of fertilization should take place. If this does not happen within 36 hours after cell maturation, the mature egg dies and leaves the blood during the next menstruation.

The fertilization process itself can take 3 hours due to internal barriers of the female body. Successful fertilization is possible only when 10 million live sperm have entered the uterus. The female body works at this moment in order to provide a temperature comfortable for conception - 37 degrees.

Basically, only one mature cell is fertilized.  In practice, there are quite rare cases when during the ovulation process several eggs are produced at once, if they are fertilized, then a woman may have twins or triplets. At the moment of division of the fertilized cell into 2 different cells, they begin.

At the time of the conception and fertilization process, the nucleus of the female cell and the sperm form a single unit called the zygote. After a day, she begins active division. The first cells received from it were called blastomeres. They also divide, gradually decreasing in size, but the size of the zygote remains at the same level.

On the 3rd day, the emerging embryo has from 6 to 8 growing blastomeres.   These particles can affect the development of twins., at this moment the embryo already has its own individual genome.

On the 4th day, 10 to 16 developing cells are located in the embryo. At this moment, the compaction of the growing embryo begins. At this stage of conception, he enters the uterus and tubes ready for bearing, there is always a certain risk of an ectopic pregnancy. This day is significant for the embryo by important changes: the growing fetal egg takes the form of a blackberry, this means the beginning of the period of embryogenesis, the formation of internal organs and systems of the little man.

The developing embryo is free and is not attached to anything until the 7th day of pregnancy, then its reliable attachment to the uterus occurs.

On what day after conception does the embryo implant

The developing fetus enters the uterus prepared for carrying it on the 5th day after the occurrence of the act of conception. It begins to be attracted to its wall, after this fixation it is covered on all sides by the nutrient membrane, and the external blastocyst connects to the blood vessels and uterine tissues. Attachment of the fetus occurs on the 6th-7th day after conception.

From the moment the growing embryo penetrates the uterus until it is firmly fixed inside, it takes up to 3 days. The process of implanting a fetal egg takes up to 40 hours. After the fetal egg is attached to the uterus, the level of the pregnancy hormone in the woman’s blood rises, which signals its possible onset. During the implantation period, small bleeding may occur, which may be mistakenly recognized as the onset of menstruation.

How to find out in the early stages, whether the desired pregnancy has come or not? What should you pay attention to during this period?

Symptoms of pregnancy in the early days are manifested in each woman individually, in some they are weaker, and in some pronounced. With the appearance of the following, the very first signs after conception, pregnancy can be ascertained:

• a few days after the conception occurred, colorless discharge may be observed,  they have a uniform consistency, without any unpleasant odor. By 12-13 weeks of gestation, they become more fluid consistency.

It is important to take a closer look at the discharge during this period: are there any bloody streaks in them, an unpleasant yellow-green hue or a curdled consistency, because this can be a clear signal about the presence of various diseases;

• breast slowly poursgains increased sensitivity. Her unusual soreness can be a clear sign of pregnancy;
• at conception there may be feelings of malaise or a feeling of depression. This condition can accompany a woman immediately after pregnancy. Some women take these unexpected signs for. Headache, fatigue, rapid irritability, a constant feeling of weakness, sudden mood swings that accompany a woman for more than one day are signs of hormonal changes in the body during pregnancy;
• from the moment of fertilization to a woman   may accompany periodic vomiting until the end of the first three months of embryo development. This does not happen in all pregnant women, everything here determines the balance between the hormone progesterone and the new functions of the organism being rebuilt.

When there are any strange changes in the body and the slightest suspicion of pregnancy, women are in a hurry to check this with help. But is it right or do you need to wait for the results to be more accurate?

When is it best to do a pregnancy test after conception?

The test will show reliable information if it is carried out a week after the delay of the upcoming menstruation. It is at this point that the “pregnancy hormone” in the urine will be enough to ascertain the pregnancy. This hormone begins to be actively produced only after attachment of the growing embryo to the walls of the uterus. And you can determine the presence of this hormone in the blood only a few days before the alleged menstruation. In urine, it is detected even later.

Now on sale there are tests that can determine the fact of pregnancy even before the delay. But here no one guarantees absolute accuracy of the result.

To accurately determine the onset of pregnancy in the early stages, you need to do a special blood test, which will reflect the content of the beta-hCG hormone. A regular pharmacy test cannot guarantee such reliability.

Conception and bearing a fetus are quite complex processes of the origin and development of a new life, which are accompanied by characteristic signs. Bearing a long-awaited child is a crucial moment in the life of every woman when it is necessary to approach with all seriousness, especially this concerns the state of health of the future mother.

It is advisable to identify your weaknesses in need of support before pregnancy, take a course, abandon previous addictions and prepare for an important event in the life of every couple in love - the birth of a baby.

A detailed process of conception will show the video:

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When a new life begins in the woman’s stomach, this process can only be compared with magic. The body of the expectant mother is being reorganized in a different way, so it makes sense to consider pregnancy by weeks in full detail. The development of the fetus occurs gradually, at the same time the sensations of the woman change.

Description of pregnancy by week: what does a woman feel, how does the fetus develop?

Below we describe all aspects that affect the development of the fetus by weeks of pregnancy. We give a complete description of the changes in the body of the future mother.

WEEK №1

This term refers to the last day of the menstrual cycle. But do not mistakenly believe that conception occurs precisely in this period.

The birth of a new life varies depending on ovulation and can occur after 2-3 weeks. You can find out what the long-awaited event happened by changing basal temperature.

It is not worth hoping for a test at home, pregnancy during this period cannot be detected even with a blood test for hCG. All signs of the birth of the fetus in the womb are absent, the lady can only hope for her intuition.

How does fertilization occur?

In the fallopian tube, the sperm merges with the egg, and this process gives rise to fertilization. Due to such changes in the body of a woman, only one cell is created, which is called a zygote. It is the basis for the formation of all the most important systems and organs over the next 9 months.

In the body of a woman, changes begin to occur. On days 5-6, an increase in the synthesis of hCG hormones can be detected. The immune system of a woman is sharply reduced in order to maintain the embryo in integrity.

Below we will write down the pregnancy by weeks, indicate how the fetus develops and find out the feelings of the woman. After fertilization, the expectant mother is unlikely to notice strong changes. In terms of physiology, they will be visible later. However, weakness, irritability, drowsiness may be felt.

WEEK №2

If we consider pregnancy from the point of view of obstetrics, this week is considered the ovulation period. The body prepares for reproduction, the egg is released by the ovaries. Some at this time have a multiple conception. Over the next 22-24 hours, the egg awaits conception, while the sperm can live for about 5 days.

If the cycle includes 28 calendar days, the ovulation period relies on the middle of this period. Conditionally, we can say that on the 14th day the egg cell matures. In cases where conception has not occurred, an unfertilized egg will come out during menstruation after 2 weeks.

Symptoms of pregnancy and a woman's sensation include changes in the hormonal environment, hypersensitivity to various aromas and tastes. Some ladies feel that they are pulling the lower abdomen, and also develops sensitivity in terms of sexual desire. These signs can not be called accurate, usually a woman does not notice them in the early stages.

WEEK №3

Conception occurs according to the following scheme: the strongest sperm make their way to the egg in just a couple of hours, the remaining "losers" die under the reproductive activity of the female body.

The zygote enters the uterus and prepares to be fixed on the uterine walls. The implantation process itself is accompanied by vaginal discharge, the expectant mother in normal cases does not notice them.

As for the sensations of a woman, it all depends on her susceptibility to physiological changes. After fertilization, some feel dizziness, apathy, vomiting, general depression.

At week 3, it is extremely important to ensure the saturation of the body with protein, iron, potassium and folic acid. All this mineral and vitamin complex can be purchased at the pharmacy. You can not overwork, so as not to encounter complications.

WEEK №4

The fourth week gives rise to the formation of amniotic fluid and placenta. They protect the fetus from damage and regulate its proper development.

In addition, the head of the child begins to emerge, and a foundation of three layers is formed for the further development of the most important organs and systems. The genes of the father are responsible for them.

Weekly pregnancy includes the development of an embryo (fetus). We will describe his appearance, and indicate the feelings of a woman. At this stage, the formation of the skeleton of the baby, the digestive tract, the thyroid gland, the liver, and the brain begins.

Mom suffers from toxicosis in the morning, she is dizzy, her mammary glands are enlarged, her nipples become painful and sensitive.

At the same time, there is a sharp change in behavior and mood, a surge of strength and vigor, or, conversely, a drowsy state. It is also worth mentioning about the weakening of immunity and high susceptibility to viruses, irritability, nervousness.

It is possible to identify the birth of the fetus in the womb by visiting an ultrasound cabinet or by making a pharmacy test. In the fourth week, it is important to switch to proper nutrition, relax more, give up crowded places in order to avoid illness, and try not to catch a cold.

WEEK №5

During this period, a woman can already feel her delicate situation, because there is a delay in menstruation, they no longer go for a whole week. In addition to the unstable psycho-emotional background, there is another symptomatology of pregnancy - physiological.

From the vagina comes some mucus, similar to the protein of a chicken egg. It is at this stage that a cork is formed, which is designed to protect the fetus from infectious infections.

If there are problems with the concentration of glucose in the blood and the level of hemoglobin, pregnancy by weeks (5 weeks) is accompanied by the correct development of the fetus and unstable sensations of the woman. Namely, dizziness appears, in some cases - fainting.

Also, the expectant mother may encounter soreness in the lower abdomen, as if “pulling” him. This is a natural process, but it is necessary to consult a doctor.

A woman is undergoing changes in the emotional environment. She feels responsible for a new life in the womb, experiences excitement and a certain fear for the baby.

Pregnancy by week, the development of the fetus with a photo will seem impressive. The fruit has already reached its first impressive size, on the order of 1.6-2.1 cm. In appearance, the small head and elongated body resemble a tadpole.

Mom must drink vitamin B9 (folic acid), which will ensure the maintenance of psycho-emotional background and comfort for the fifth week.

WEEK №6

Pregnancy by weeks implies that in order to determine the development of the fetus, it is necessary to do an ultrasound, starting directly from the sensations of the woman. To understand that the fetus is formed correctly, the measurement of the coccyx-parietal size (CTE) will help. If the indicators are within the norm of 5-6 mm., Everything is in order.

A certain semblance of the baby’s legs and arms appears, as well as fingers. At this stage, cheeks, mouth, jaw line and chin are still forming.

The expectant mother is also experiencing change. Hormones are raging, leading to a change in eating habits. A woman is tormented by brutal appetite, sometimes on the contrary, food causes gagging.

Toxicosis may or may not be. Weight gain is also not felt. Vaginal discharge can smell unpleasant and cause discomfort, which indicates fungal lesions (you must consult a doctor).

At the sixth week, some girls already noticeably round the lower abdomen. You can determine this by the usual tight-fitting clothes, under which everything is visible.

In order not to aggravate your condition and not harm the fetus in the womb, we advise you to refuse to visit the sauna, swimming pools, solarium. Do not stay in smoky rooms, do not come into contact with household chemicals.

WEEK №7

At the seventh week of gestation, the placenta is already quite formed, and therefore can correctly perform the tasks of enrichment and nutrition of the fetus. The kid grows quickly, reaches a weight of 2 grams. and in the amount of 1.7-1.9 cm.

Pregnancy by weeks (week 7), more precisely, the development of the fetus occurs systematically and the sensations of a woman change. Both hemispheres of the brain are already formed in the child, the central nervous system and skeleton are developing.

The body is equal in size to the head, a small tail is visible in the coccyx. Blood circulation is well regulated, the placenta performs its tasks of enriching the fetus with oxygen. It also protects against infection and toxic substances.

The heart muscle has 4 chambers, which ensures correct blood flow in a small body. The skin includes 2 layers, the upper of which is called the epidermis.

During the passage of the ultrasound, the mother can already notice that the baby's fingers are visible, and the embryo adapts and bends the elbows with the knees for convenience.

Tissues of the musculoskeletal system are transformed into full bone tissue slowly but surely. And if you look at the face, you will notice the upper lip, the nose with small nostrils. In the mouth, the laying of the first teeth begins, the formation of the auditory system occurs.

Pregnancy by week, namely by the end of 7 weeks, the development of the fetus is gaining other momentum and the woman's feelings are changing from this. A tubercle appears between the legs of the child, subsequently, using the ultrasound, the sex of the baby is revealed by this sign.

Closer to the eighth week, a woman begins to experience all the hardships of bearing. In addition to the fact that she suffers from toxicosis, apathy and fatigue, this also adds swelling of the extremities and face, urination with frequent intervals, impaired gastrointestinal function (constipation, heartburn, increased gas formation).

Due to the accelerated development of the child, the uterus takes on the size of a large apple or orange. Therefore, the expectant mother feels that the stomach is pulling below, there is a certain pressure and heaviness. Nipples take on a darker shade; a dark line runs from the navel to the lower abdomen.

WEEK №8

Even if the woman is extremely inattentive, according to the signs expressed at 8 weeks, she will precisely guess that she is pregnant (if the delay of menstruation is not taken into account by distraction). The main features include a rounded abdomen, which is clearly visible.

The lady's gait becomes systematic, her chest swells slightly and rounds, her hips gain splendor. Depending on the condition of the skin, it may become imperfect or, conversely, perfectly smooth and radiant.

Particular attention is paid to taste buds and preferences in food, this is what characterizes pregnancy in weeks over eight. The development of the fetus is rapid and the sensations of a woman are replaced by others.

Very often there is a desire to eat something that is clearly not seasonal. Sometimes thoughts about how delicious it would be to eat a banana with pickles flashed through the head of a pregnant woman. Some, on the contrary, are already very selective in food.

The child in the womb is growing rapidly, its weight reaches 2.1-3.2 grams, and the size is equal to or greater than 2 cm. Almost all the most important organs and systems are already in place, they only have to develop and function.

There is the ability to move your fingers, compress and unclench your fists, the tail disappears on the tailbone. Joint and bone tissue grow stronger with each passing day.

The embryo in the womb no longer has a clear resemblance to an alien creature. The formation of the visual system originates, the eyes approach each other.

If at this stage you are examined and undergo an ultrasound, you will see the auricles that have appeared and the contour of the face, on which the facial expressions are not so clearly visible yet. It is at 8 weeks that the baby shows a certain reaction to touching the mother’s stomach.

WEEK №9

At this crucial time, weekly pregnancy (week 9) is characterized by the fact that the embryo has grown enough. The development of the fetus proceeds quickly and the sensations of a woman succeed each other.

The baby has formed legs with arms, the head is still large and rounded in size located on the chest.

The size of the baby is approximately equal to the grape, which moves arbitrarily in the liquid. The first sexual signs appear, but ultrasound will not reveal this, you will have to donate blood for analysis.

Extremely responsible period for the expectant mother. It is important to monitor the discharge: if they acquire a greenish or yellowish tint, a doctor’s consultation is urgently needed.

Pregnant should be alert for painful cramps that appear in the lower abdomen or lower back. A doctor may order a biopsy to rule out fetal malformations.

Feels like a woman can suffer from constipation, heartburn, digestive problems. It is worth giving up heavy food. To cope with vomiting with toxicosis, you need to drink green tea or a decoction on rose hips.

WEEK №10

This time is considered more or less calm, because the pregnant woman’s body has already adapted to the changes. The fetus has organs and systems, the development of the cerebral hemispheres continues. The weight of the “grape” is close to 6.8-7 g., The head rises and is not so clearly adjacent to the chest.

Description of pregnancy by weeks is so good that you can observe the rapid development of the fetus and measure the sensations of a woman. During this period, it is considered amazing how the brain develops. Due to the fast process, many neural chains are formed during each minute.

The baby's fingers are getting longer, but there are still membranes between them. Due to the correct location, the main internal organs (kidneys, liver, respiratory system, intestinal tract) continue their development.

At this stage, another important event occurs - sex hormones are synthesized (testosterone or estrogen, depending on gender).

As for the sensations of the pregnant woman, the lady feels heaviness and enlargement of the mammary glands, veins are clearly visible on the chest. The belly is already decently rounded, so it makes sense to buy clothes more comfortable.

The pressure on the pelvic organs increases in connection with the development of the fetus and a corresponding increase in the uterus. A woman may change the psycho-emotional environment due to changes in weight and body shape, but do not despair. Relax more and pamper yourself with beautiful underwear.

WEEK №11

When 11 weeks of pregnancy come, the development of the fetus has already reached about 5-6 cm in size, and its weight varies between 10-11 g.

At this time, weeks of pregnancy should be considered from the point of view of the correct development of the fetus and sensations of the woman. If you come for an examination, the doctor will identify gender and measure the correctness of the development of the gestation period.

During the examination, you can hear the heart rate, which is approximately 135-140 beats per minute. Due to the rapid development, the baby needs more nutrients, blood vessels begin to grow in the placenta.

At week 11, hair follicles and auricles form. The fetus is less and less like an alien.

The expectant mother also feels lighter, toxicosis subsides little by little, he will completely disappear closer to the 14th week of gestation. But there is still intense urination, which is quite normal for pregnant women.

To reduce the burden on the urinary organs, it is recommended to drink more water, but refuse salty foods. Caffeinated drinks are excluded without fail.

During this period, it is already worth thinking about applying natural oils from stretch marks to the stomach and chest. We also advise you to start attending the sports section for pregnant women to always be in shape and ensure the correct formation of the baby.

WEEK №12

When 12 weeks are pregnant, fetal development is even faster. At the end of the third month of gestation, the risk of miscarriage is significantly reduced. The woman is quite accustomed and accustomed to her "ticklish" position, so she can relax.

The future mother calmly lies and reads about pregnancy by weeks, studies everything regarding the development of the fetus, but the sensations of a woman must be taken into account. Colossal changes are taking place in appearance.

The face becomes light, skin tone - even. The hair looks shiny and thick, which indicates the correct course of pregnancy. During this period, there is a risk of constipation and heartburn, so you must follow the recommendations.

Despite the improvement in health and appearance, we still recommend that you give up fast food and other junk food. Continue to do fitness, walk more, lean on protein dishes.

If we consider the development of the fetus, its size has already reached 6.5 cm, and its weight is 13 g. The lungs and the entire respiratory system are noticeably strengthened, the gastrointestinal tract activity is stabilized, the head rises higher due to the efforts of the baby. He even tries to suck his finger. It should be carefully, because the child is already able to respond to voice and sounds, as well as feel pain.

WEEK №13

This weekly pregnancy period gives rise to the second trimester, respectively, the development of the fetus and the sensations of the woman gain other momentum. Continue to adhere to advice on the intensity of physical activity and proper nutrition.

As for the external signs of a woman, the waistline is blurred, the breast is increased by an order of magnitude (in some ladies up to 2 sizes). We advise you to buy a supportive bra.

Colostrum will stand out from the nipples, the uterus rises, thereby eliminating discomfort. The frequency of urination decreases, so a woman feels much easier, despite the rounded belly.

There should be no soreness in the lower abdomen and in the lumbar region. But if you notice such symptoms, be sure to visit your doctor. As for the discharge, they should be white without a pungent odor.

In the growth of the baby reached 7 cm, its weight varies between 16-20 g. The baby quickly develops sensitivity, he reacts extremely violently to mother’s mood swings, noisy exclamations, pain, temperature, light.

The fetus has changed in terms of physiology, its ears are clearly visible on ultrasound, the bone tissue becomes solid, and muscle is still being formed. The eyes are closer to each other, so the resemblance to an alien creature is minimal.

Pregnancy by weeks in the second trimester is so good because the development of the fetus is interesting and the woman's feelings change, respectively. At the beginning of the second trimester, the baby already sees dreams, but they can only last 1-2 minutes.

But the motor system is being improved. In addition to flexion and extension of the knees and elbows, the baby is already fully waving his limbs, crosses his legs, raises his head.

WEEK №14

At this point, the future mother has become so accustomed to her interesting position that she is not at all afraid of responsibility. The waiting period begins. A woman finds harmony with body and soul, prioritizes.

The chest is growing rapidly, the hips are becoming wider, the uterus rises higher. Be sure to pick up loose clothing that will not hamper movement.

For the correct development of the baby, it is necessary to abandon the sweet and introduce more protein products into the diet. Weight starts to slowly arrive, so watch out for the arrow on the scales and don't overeat.

The fruit has already reached 10 cm in height. Its weight is about 50 g. On ultrasound, you can notice not hidden, but distinct facial expressions. The respiratory system works smoothly and continues to improve. The production of insulin starts, a certain mode of wakefulness and sleep appears.

Pregnancy by week in the second trimester determines the development of the fetus, or rather its heart muscle, which depends on the behavior and feelings of the woman. Mom should not be nervous so as not to provoke a rapid heart rate in the child.

WEEK 15

Despite the well-being, you still can not forget about an active lifestyle and a balanced diet. As for the other sensations of the woman, there may be some discomfort associated with the teeth. If there is pain or caries, consult your dentist in time to prevent the development of infection.

At the 15th week of pregnancy, immunity drops sharply, so try to avoid crowded places and friends with respiratory diseases. If the first signs of SARS appear, immediately see a doctor!

Hormonal changes occur in the previous mode, which leads to drowsiness and apathy. Do not worry, rest more, because after the baby is born, this will become an inadmissible luxury for you.

Do not panic if there is a slight soreness in the lower abdomen. In connection with the growth of the uterus and the development of the fetus, sprain of the ligaments and muscle tissue occurs, which leads to some pain. But with severe attacks, run to the doctor.

Varicose veins already appear in the second trimester, so it makes sense to choose comfortable shoes and compression stockings if necessary. To relieve fatigue and heavy leg syndrome, the limbs should be massaged several times a day.

Yes, a weekly pregnancy is characterized by the rapid development of the fetus and the sensations of a woman that she does not always like. But you have to endure until a more stable and "quiet" period.

By the 15th week of pregnancy, the baby has already grown enough, its size is commensurate with the apple. He is still actively moving, crossing his legs, twisting his head.

Dreams are short-lived, eyes are still closed, but optic nerves form throughout. The kid is able to respond to darkness or bright light. Sweat glands begin to work, the first hairs appear from the follicles.

WEEK 16

Finally, the time has come when the fetus turns into a baby. It looks more and more like a baby, the skin is still thin, but the vessels are already visible. In growth, the baby reaches about 12-14 cm, and its mass is already 100-110 gr.

At the 16th week of pregnancy, changes in the composition of the blood occur, platelets with red blood cells and lymphocytes are produced. The accelerated synthesis of hemoglobin begins.

By ultrasound, you can see what facial features are inherent in the baby, he has cilia and eyebrows. The whole body is covered with a whitish lubricant that will protect thin skin until the time of labor.

Feels like a woman is gaining weight, and rapidly. Therefore, it is important to monitor your daily diet and not overeat. Otherwise, pressure surges will appear.

Pregnancy by week (week 16) is characterized by a gait like a duck, this is all due to the accelerated development of the fetus, and the woman experiences other sensations. Not primiparous can already feel how the baby moves.

WEEK 17

A woman loses her ability to work, the psycho-emotional environment suffers, nerves “play pranks”. It would be very opportune to support a loved one, communicate with friends and relatives.

Body weight is rapidly increasing, painful cramps and heaviness in the sacrum appear. The pregnant woman quickly overwork, jumps in body temperature (fever, chills). The sensations include mood swings, which are the result of fatigue.

At this time, the baby is fully developing in the womb of mom. His height has already reached 13 cm, the child devotes more time to sleep than wakefulness. After waking up, he grimaces and pulls the handles.

The baby clearly hears sounds, reacts to touch, darkness and light. Loud exclamations scare the child, so mom’s soothing voice will come in handy.

The child's adrenal glands and pituitary gland are actively developing and improving. At week 17, the organs of the reproductive system are formed in girls.

WEEK 18

A weekly description of the pregnancy affects the development of the fetus and the sensation of the woman at 18 weeks. The future mommy can no longer sleep comfortably due to the rounded abdomen, so during the rest you have to be sophisticated in every way.

Brutal appetite appears, which must be fought to avoid gaining excess body weight. It was at week 18 that a woman significantly gained weight. With the consumption of carbonated drinks, snacks and other "muck" appears heartburn, flatulence, constipation.

There are possible problems with the teeth, they begin to crumble due to a lack of calcium. Be sure to introduce milk, fish, meat, cheese and eggs into everyday food.

The areoles expand and darken, the chest acquires a strong sensitivity, which is not always comfortable. A woman increases in size, feels like a “hippo”, this provokes depression.

But do not despair, just consider the development of the baby in the womb. He reached 0.2 kg. weight and 18 cm. height. It is important for the child to hear the mother’s voice, so talk with him constantly for the stable development of the central nervous system.

During the period of the baby’s activity, the mother sometimes feels kicks in the stomach, this indicates the improvement of the musculoskeletal system. The fingers of the baby are developed, the first prints appear on them.

WEEK 19

Pregnancy by week (19th week) is characterized by the fact that heartburn and vomiting with toxicosis have already receded. The development of the fetus is rapid and the sensations of a woman change from this. The skin begins to itch due to the rapid rounding of the tummy, it is necessary to use creams for pregnant women to reduce sensitivity.

Cramps of the lower extremities, heavy leg syndrome and swelling may occur. Doctors in such cases prescribe drugs for Magnesia.

Fatigue and heaviness appear in the back, it is enough to do light gymnastics. Pregnant women at this time are recommended to measure physical activity with rest. In the absence of deviations in the development of the baby, you should do business and walk more.

In no case do not appoint bed rest for yourself. Otherwise, the muscles will weaken, childbirth will pass with complications. As for the baby, he has already reached 230-250 grams in weight, almost constantly sleeps, and after waking up he kicks.

When mom walks, the child feels motion sickness. When a woman lies down, tremors are felt in her stomach. The baby’s sebaceous glands still work intensively, covering it with a white film.

WEEK №20

At this stage of pregnancy, a period of rest for the expectant mother begins. You feel better than ever and just bloom. The tummy will be visible, but it will not interfere with usual affairs. You can move without problems.

Feels like you can already understand how the child is developing. If you feel strong shocks, this is a signal that the baby does not have enough oxygen. Ventilate the room or, if possible, take a walk in the fresh air.

It sometimes happens that tremors can occur after physical activity. In this case, it is better to lie down and relax. Pregnancy is a crucial period, you need to sleep on this period on your side. By weeks, fetal development can be felt in different ways. Therefore, the sensations of women will be slightly different.

Resting on one side will help to avoid squeezing veins and tubes of internal organs. Also at week 20, you need to eat more foods that are rich in iron and calcium. Among these, buckwheat, prunes, beef, spinach and cottage cheese should be highlighted.

At this stage of pregnancy, fetal growth reaches about 23 cm, and its weight reaches 300 g. The kid can already tumble, play and yawn. The limbs begin to form correctly, become proportional to the body. The head is gradually reduced. Hair and fingernails begin to grow.

WEEK №21

At this time, experts assure that mommy is able to shape the baby’s future taste preferences. If you regularly eat sweet, spicy, salty and spicy dishes, in the future the child is unlikely to want to eat lean food or vegetables. You will have to try to force it.

Unfortunately, you will also experience flatulence and frequent hunger. The vein load does not disappear. If you do not restrain yourself, you will quickly gain extra pounds. The size of the fetus will also increase. This can cause birth problems.

During pregnancy, it is better to eat often, but in small portions. By weeks, fetal development will be much better. The kid is changing correctly. And the sensations of a woman will improve, some discomfort will disappear. The child already reaches about 26 cm in height, and will weigh 340 gr.

Outwardly, the baby is almost like a newborn. The fetus remains to grow and gain weight. A special liquid in the womb allows the baby to recognize what mom was eating. When the baby begins to move at such a time, tubercles can be seen on the stomach.

WEEK №22

The stomach becomes noticeable. Even with outerwear, it’s hard to hide changes. If the specialist has not identified any deviations, you can continue to lead a familiar lifestyle. At 22 weeks of gestation, you will bloom, your skin will noticeably improve.

Pay attention to the swelling of the limbs. A similar phenomenon occurs due to fluid retention in the body. In this case, you need to consume less salt. If you experience anemia, additional tests must be done. Go through a full examination and do an ultrasound.

Pregnancy by weeks is characterized by the fact that the development of the fetus at this period occurs rather quickly. The baby weighs more than 400 grams, and height can reach up to 30 cm. Large sizes of the child interfere with an active lifestyle and women's feelings become more pronounced. The fetus, meanwhile, forms a nervous system.

WEEK №23

The 23rd week of pregnancy still allows you to enjoy your vacation. You will no longer be bothered by toxicosis or heartburn. At such a time, it is important to try to keep your own weight within normal limits. The development of the fetus is quite active. By this time, girls on average gain up to 7 additional kilograms.

The stomach begins to rise higher. Soon you will feel tension and fatigue in the lower back. If the deadline fell during the hot summer, swelling of the limbs can not be avoided. Try to drink a little less water and discard salty foods.

When resting, place a pillow under your feet so that they are just above your body. If you regularly have cramps, forget for a while about the shoes on the rise. Include tocopherol and calcium rich foods in your diet.

The development of the baby is actively ongoing. Its weight can reach 420 gr. The fruit itself will look shriveled. This feature will pass as soon as the child has accumulated a sufficient amount of subcutaneous fat. The baby at this time is busy only with the absorption of nutrients.

Pregnancy by week is very interesting. The development of the fetus is based on its formation of the respiratory system. The child is trying to do trial exercises. The baby sleeps most of the time, he is already able to see long dreams and feelings of a woman can be varied.

WEEK №24

The 24th week of pregnancy manifests itself in the form of an increase in the baby along with the stomach. There is a risk of stretch marks. After giving birth, with proper physical training, you can get rid of them. The development of the fetus continues actively.

At 24 weeks, the expectant mother feels very well. The first trimester is considered the most dangerous. It’s too early to think about childbirth. At such a time, you need to calmly do your usual business, walk, relax, chat with loved ones and go to nature. The main thing is to follow a diet.

Often, a specialist during the examination can make a diagnosis - pelvic presentation of the fetus. Do not panic and do not be upset, this phenomenon is absolutely normal. The baby closer to childbirth will change its position. The weight of the fetus can already reach 0.5 kg.

At this time, the baby learns to exhale and inhale, but the main oxygen enters the umbilical cord. In a child, brain formation continues. Significantly increased the number of neural connections. The baby in the womb sucks a finger, can grimace, play with the umbilical cord and even frown.

WEEK №25

The 25th week of pregnancy visually manifests itself differently in everyone. Therefore, the size of the abdomen can be larger or smaller than the rest. The uterus increases significantly. From this feature there is pressure on the digestive tract. Often manifested heartburn. The development of the fetus continues according to the scenario.

In order not to encounter a common problem in the form of constipation, it is strongly recommended to include various cereals and fresh vegetables in the daily diet. Pregnancy by weeks can already be painted. If necessary, you need to start taking drugs with a high iron content.

This procedure will eliminate the development of iron deficiency anemia. It is also recommended that you wear a special bandage regularly. It will reduce the load on the back. As for the baby, the development of the fetus should not bother you and the sensations of the woman will already be familiar.

In rare cases, premature birth occurs. A child at this stage of development is quite viable. The baby will be placed in special conditions. The child will ripen to 40 full weeks. In the womb, the baby weighs 0.7 kg. Growth can reach 35 cm.

With the normal course of pregnancy, the baby's bone system is strengthened. Muscle fibers are actively developing. The child is already quite capable of grabbing something. The child clenches his hands into fists. In this way, the leading arm is determined.

WEEK №26

26th week of pregnancy - the woman’s body continues to be subjected to even greater stress. In this case, it is worth going on maternity leave. The development of the fetus does not stop. Often at this time, absent-mindedness and forgetfulness are manifested. It’s also more difficult for you to walk, especially when you are overweight.

Normal is considered to be up to 8 kg. weight. When walking, a large load is placed on the lower back. Carefully monitor your own condition. With the tone of the uterus, bed rest is laid. If you begin to feel pains and bleeding, immediately call an ambulance.

The mass of the fetus inside the womb can reach 1 kg. The baby's skin color begins to change. It becomes lighter due to accumulated subcutaneous fat. Muscles get stronger every day. Therefore, when you push the child, you will feel unpleasant pain and discomfort.

WEEK №27

Pregnancy by week makes itself felt. At this time, it is becoming increasingly difficult for you to carry out routine business. The development of the fetus continues rapidly and the sensations of a woman in such a period are diverse. You get tired quickly, it takes more time to relax.

Week 27 requires a vacation. Take care of your favorite hobby, which does not cause trouble. Believe me, after giving birth you will not have so much time. Watch out for food. During this period, it is very easy to gain excess weight. Control yourself.

When the uterus begins to grow, various effects are manifested. Heartburn and shortness of breath develop. The child is actively growing at this time. The brain is developing rapidly. The foundations are laid in the form of attention, memory, and even character.

At this time, you must continue to eat foods that contain a sufficient amount of calcium. The baby is actively improving the skeletal system. Subcutaneous fat also continues to accumulate. The pigmentation of the skin changes. Immunity is formed due to the placenta.

WEEK №28

Depending on how many kilograms you have gained, sensations may vary. If you have recovered more than 9 kg., The movement is much more difficult. You become awkward. Drowsiness and fatigue are manifested to a greater extent. Digestive problems may occur.

Pregnancy by week will be easier if you regularly arrange fasting days after consulting a doctor. The development of the fetus should not bother you, because the baby is already in the right position. You can notice about 10 conversations in a couple of hours and the sensations of a woman become quite interesting.

WEEK №29

The baby begins to show increased activity, it becomes cramped in the womb. It will feel like he has become much stronger. The height of the child reaches 36-40 cm, and its weight can be about 1.5 kg. The visual system begins to show a reaction to light flashes.

The baby can hiccup and cough. You will certainly feel it. The emotional sphere is actively developing. The baby is able to cry. At this time, the baby has almost formed internal organs. Respiratory organs continue to improve, muscles become stronger.

At this time, yoga is highly recommended. Start such a practice only after consulting with your doctor. Master the Kegel technique without fail. Such procedures make it easier to control your body. At week 29, increased irritability and fatigue are felt.

WEEK №30

The abdomen noticeably grows and stretches thin skin. Stretch marks appear in the hips. Proper nutrition will help bypass the swelling of the extremities and frequent constipation.

Rest if you become more exposed to weakness and dizziness. Learn a special technique that helps you relax.

Pregnancy by week is becoming more interesting. The development of the fetus continues, the relationship between mother and baby is improving.

And the sensations of a woman are greatly exacerbated. You may be annoyed by the stuffiness in the room. You begin to get very nervous when you feel a faint odor.

WEEK №31

At this time, you can feel all the unpleasant sensations that were before, only to a greater extent. Breathing is noticeably worse, you are increasingly faced with shortness of breath. Such consequences are due to the fact that the uterus displaces all internal organs. Often there are swelling and cramps.

You often start to suffer from insomnia. To cope with such troubles, it is important to have a positive attitude. Regular relaxing massages and systematic yoga classes will help. Try to drink less fluids. If necessary, limit your walks. Eat right.

The baby's height can reach 43 cm, and weight - 1.6 kg. The child learns to manage 5 basic feelings. Neural connections begin to grow at an incredible rate. The baby sleeps less and is more awake. We can say that he does his own thing.

WEEK №32

The female body independently prepares for the birth process. In some cases, false contractions may occur. The abdomen at this time is large enough and often pulls down. Therefore, it is strongly recommended to wear a bandage.

Your usual actions become awkward and slow. It simply becomes inconvenient for you to do anything. Pregnancy by weeks at such a time makes itself felt. Do not deny yourself the desire to relax more. The development of the fetus can be felt due to strong shocks.

You will have to choose a suitable position longer to get settled, fall asleep. And the sensations of a woman are not the most pleasant. The height of the baby can reach up to 45 cm. As for weight, it is about 1.8 kg. A child can roll head down, as it should be.

During this period, it is recommended to talk with the baby. His brain is quite developed. Read books aloud, include classical music, compositions. At this stage, the child can be greatly affected. Meanwhile, his muscles continue to strengthen. Coordination of movements appears.

WEEK No. 33

A woman is allowed to gain up to 12 kg. total weight. Keep in mind, at such a period, the hormonal background is greatly increased. Gums sometimes bleed frequently. Due to the fact that you begin to be afraid of childbirth, irritability increases significantly.

Try to live in joyful emotions and positively tune yourself. Remember to exercise regularly for pregnant women. This practice keeps your muscles toned. Otherwise, you will not be able to control your body during childbirth.

At 33 weeks, the baby should take the correct position inside the womb. His weight is approximately 2.3 kg., And his height is close to 46 cm. The child continues to actively develop the musculoskeletal system. The fetus becomes like a baby.

WEEK №34

Pregnancy by week is becoming increasingly difficult in terms of mobility and the inconvenience of performing familiar activities. The development of the fetus is felt stronger and the sensations of a woman can be unpredictable. As for the hormonal background, it is stabilizing.

You leave behind irritation and negative thoughts. There is a good mood, you are just looking forward to the baby. Total body weight can increase up to 15 kg. The chest continues to grow. The areola of the nipples and the line from the navel to the lower abdomen noticeably darken.

The growth of the baby at this time is 47 cm. Weight can range from 2.1 to 2.4 kg. The skin of the child is smoothed and becomes light. The epidermis is coated with a protective compound. If a child is born at such a time, he will be able to breathe on his own.

WEEK №35

A fairly responsible period begins. It is necessary to prepare for childbirth. Do not be lazy and take special courses. Visit relevant consultations. Try to choose a suitable birth partner. The husband does not have to be suitable for such a role.

At this time, the stomach grows to the maximum. You start to get tired quickly when walking. Puffiness cannot be avoided. It is forbidden to overeat. Otherwise, the baby will grow up noticeably. Childbirth can be complicated.

Pregnancy by week is almost coming to an end. The development of the fetus is in its final stage. The baby continues breathing training. Swallowing, sucking reflexes develops and the sensations of a woman can be ambiguous.

In the body of a future mother, the amount of amniotic fluid decreases. For the baby, this contributes to the manifestation of discomfort. Instinctively, the fetus realizes that it is time to get to a more suitable place. At the same time, the child continues to actively develop the nervous, endocrine and immune systems.

WEEK No. 36-40

In such a period, the mother's body is already completely ready for the appearance of the baby. 14 days before the deadline, the abdomen drops and becomes very hard. This phenomenon indicates that the uterus comes in tone. You can face fights at any time. They can be false (training) or real.

At this time, a woman can gain up to 16 kg. weight. Closer to childbirth, this indicator is reduced. Without fail, go to a doctor’s consultation once a week. He must monitor the condition of the child. From 36 to 40 weeks you will feel a significant increase in appetite.

Sometimes discomfort in the lower abdomen is manifested. Soon you will feel quite unpleasant sensations. Contractions often begin with cramping. They occur with the same frequency. About 5 times in 1 hour. Also, diarrhea and vomiting are not ruled out. The body begins to cleanse.

A mucus plug comes out just before delivery. The discharge of water begins. Childbirth has begun, hospitalization is immediately necessary. At such a moment, the child can already reach 54 cm. Weight, on average, reaches 3.5 kg. The kid is fully formed and ready to see the light.

If you read this article to the end, you can safely say that the lesson of pregnancy is mastered by weeks. Now you know everything about the development of the fetus and the sensations of a woman. Do not forget to monitor your health, compare the wakefulness and sleep patterns, eat right.

A woman is created by nature in such a way that at least once in her life she can give the world a new man. The period of expectation and birth of a child is the brightest and at the same time alarming time. But the future mother should not worry in vain. She should know that a normal pregnancy is the key to the proper development of her child.

If a woman has a clear idea of \u200b\u200bhow the baby’s body is formed throughout pregnancy, then it will be quite simple for her to do everything necessary in order to avoid the development of pathologies.

Should a woman know how her child is developing?

Knowing how intrauterine development of the fetus takes place by weeks, the expectant mother can correctly organize her diet and daily routine. Also, having full information about what changes are considered normal, a woman will avoid a state of unjustified anxiety.

Calculating the intrauterine development of the fetus by weeks, it should be noted that it lasts 40 of these calendar periods. In other words, a woman's pregnancy lasts 280 days. During this time, the child undergoes a complete process of formation and development of all organs and systems.

Gynecologists consider intrauterine development of the fetus by week and by period, which are two: fetal and fetal.

The first lasts from the moment of fertilization of the egg to the 8th week of pregnancy. In this period, after fertilization, an embryo is formed, which descends into the cavity and attaches to it. The fetal period lasts from the beginning of the 9th week until the time of birth. The embryo is transformed into a fetus, develops and grows.

The division of pregnancy by trimester is also common:

• First trimester (1 - 12 weeks).
• Second trimester (13 - 27 weeks).
• Third trimester (28 - 40 weeks).

Now it is possible to consider in more detail how intrauterine development of the fetus occurs by week.

What happens in the embryonic period?

The most important of this developmental period is the formation of the embryo. Over time, he begins to take on the shape of a person. The embryo forms from the moment the egg is fertilized. This usually occurs in the fallopian tube.

From the moment of fertilization of the egg, the development of the fetus begins.
According to the weeks of pregnancy, a morula forms in the first seven-day period. It is a multicellular organism, the prototype of the embryo. The morula joins the uterine wall, and the umbilical cord and the external membranes of the fetus form from its external cells. From the cells that are located inside it, the organs and tissues of the unborn child are formed.

What does a woman feel?

In the first week of pregnancy, a woman has a slightly elevated body temperature, it is close to 37 ° C. There are no hormonal changes in the body yet, but the expectant mother instinctively feels the changes taking place. From this moment, a woman should be very attentive to her diet and lifestyle, eliminate bad habits and follow the doctor's recommendations.

Each expectant mother will be very interested in how the development of the fetus occurs during the weeks of pregnancy. This information will help a woman prevent many dangerous conditions. The third week of pregnancy is alarming in that it is during this period that there is the greatest risk of fetal rejection. The immune system of a woman's body is trying to reject the embryo. However, in response, a special protein is released that suppresses this protective reaction, and the unborn child has a greater chance of survival.

What happens to the embryo in the first weeks of pregnancy?

This period is also characterized by the formation of the placenta. The unborn child in three weeks is a ball with a diameter of 0.2 mm. But during this period, the lungs and respiratory organs, the cardiovascular system, the spinal cord and the brain are actively formed, as well as the face and gender of the baby.
A woman begins to feel mood swings, drowsiness and fatigue, early toxicosis may occur.

Further development of the fetus (this is the fourth in the weeks of pregnancy) is very intense. The unborn child has three germ layers:

• endoderm - the basis for the development of internal organs;
• mesoderm - from which the skeleton and bones will form;
• ectoderm - a material for the formation of the nervous system.

The embryo already has a pulsating tube that turns into a heart. An ultrasound during this period listens to a heartbeat. Respiratory organs, the brain continue to form, the face looms more distinctly. The embryo appears limbs, and by the end of the week they are already bent. The fetus is located in the placenta and maintains contact with the mother through this organ.

He already has a heartbeat!

During this period, many women only learn about their pregnancy, especially if it is the first. Having ascertained this fact for herself, the expectant mother is interested in the main question: how does the fetus develop?

By weeks of pregnancy, this is the fifth calendar period. At this time, the embryo still has little resemblance to humans, but it already has a heartbeat, gender is clearly defined, kidneys, liver, pancreas and thyroid gland are formed.

Already at the 8th week, the future baby takes on the shape of a person, his height is 3-4 cm. He has already formed arms and legs, his forehead is clearly visible, the outlines of his eyes, lips and nose are outlined. Actively formed and developed internal organs. The stomach is already capable of producing juice, the heart is full, the intestines are growing, the trachea and bronchi have appeared. The spine, brain and limbs are actively developing.

By the end of the eighth week of pregnancy, the embryonic period of development ends, but the first trimester is still ongoing. The unborn child has already acquired a human appearance, placental-uterine circulation is formed.

Fetal period

This stage begins from the 9th week of pregnancy and lasts until the birth. The fetal period is divided into two parts:

• early (9 - 28 weeks);
• late (29 - 40 weeks).

At an early fetal stage, fetal development continues. By weeks of pregnancy, this is the ninth. At this time, fetal growth is 40-50 mm. He begins to show activity: bends the arms and legs, turns his head, brings his fingers to his mouth. But mother is still not able to feel it, the fetus is still too small.
  Outwardly, the future baby looks like a man with a big head. The eyes are still covered, and the skin is transparent. The genitals begin to form, and this process will continue for the 20th week. The cerebellum and pituitary gland develop. The heart has four chambers. The tail disappears, being replaced by the tailbone.

The embryo turns into a fetus

At the tenth week of pregnancy, the embryo is already called the fetus, and weighs 5 grams. In his photographs, isolated fingers, neck, elbows, knees of the eyelids and upper lip are already visible.

The tongue has taste buds, the thickness of the umbilical cord increases.

The eleventh week of pregnancy is characterized by the further development of the fetus. He already has cilia and milk teeth. The rectum is formed. The spinal cord is already producing red blood cells. The intestines are ready to go.

Many mothers during this period are sent by a gynecologist for a planned ultrasound. Passing this procedure, women are interested in the main question: is the fetus developing normally?

In the weeks of pregnancy, the twelfth period begins. During this period, the child has formed phalanges of the fingers and earlobes, he opens and closes his eyes. The intestines are already contracting, and the liver is capable of secreting bile. The baby's circulatory system is functioning, white blood cells appear.

At the twelfth week, the first trimester of pregnancy ends and the second begins.

The kid is actively growing

During this period, all fetal systems are formed; their development and growth is underway. At the thirteenth week, which marks the beginning of the second trimester, the baby reaches 80 mm in length and weighs about 20 g. At this time, the skeleton is intensively formed in the fetus, the pancreas begins to produce insulin.

The gynecologist will direct the expectant mother to the first genetic study. After examining the results of ultrasound, the doctor will be able to tell you how intrauterine development of the fetus occurs during the weeks of pregnancy, whether the indicators correspond to the norm.

At the 14th week, the child's face continues to form, facial expressions, eyebrows and hair appear on the head. On the body, the fetus forms a fluff and a cheese-like lubricant. The thyroid gland begins to work, its own hormonal background develops.
The excretory system functions, the child makes respiratory movements.

In the antenatal clinic, you probably saw a stand that shows the intrauterine development of the fetus by week.

A table with this kind of information will be useful to every woman.

At the fifteenth week of pregnancy, the baby develops hearing, the intestines form the original feces, the placenta thickens. The fruit weighs about 50 g, its height is 60 mm.

The expectant mother feels the first movements of the baby

The sixteenth week of pregnancy is marked by an increase in the volume of amniotic fluid. The child is actively moving, and mom begins to feel it. Muscles are developed on the face and facial expressions are characteristic of the child at this time. Bones and nails are almost completely formed, the skin is very thin and blood vessels are clearly visible through it.

During this period, the gynecologist directs the woman to a second genetic screening. For this, the expectant mother will have to undergo a second ultrasound. It clearly shows the intrauterine development of the fetus by weeks. Photos that can be taken at this stage are presented below.

Counting fetal movements

From the 28th week of pregnancy, the third trimester begins, and from the 29th - the late fetal period. At this time, the baby is cramped in the womb, and his movements are not so active. Nevertheless, a woman should clearly monitor tremors, their number should be at least 10 per hour. The brain is actively developing, and furrows appear on it. The teeth are enameled, the eyes are capable of focusing. The baby's weight is about 1250 g, and height is 37 cm.

At the 30 - 31st week of pregnancy, the baby is already taking its final position in the uterus. The fetus is actively gaining weight by increasing muscle mass and subcutaneous fat. If a baby is born during this period, he has every chance of survival.

Further intrauterine development of the child (this is the 32nd calendar period by week) is characterized by the improvement of the immune and nervous systems. The child has his own schedule of wakefulness and sleep, he has his own temperament. The baby weighs 1800 g, and his height is 42 cm.

At the 33 - 34th week of pregnancy, the baby actively trains the lungs, perceives the entire environment in full. The skin of the fetus becomes smooth, the bones of the skull get stronger.

Baby is preparing for birth

At 36 - 37 weeks of gestation, the fetus prepares for birth. In the mother’s stomach, it’s already crowded and it’s more difficult for him to move.

In his body there are enough fat reserves for thermoregulation after birth, the lungs are ready for breathing. The gun on the body is already absent, but the hair on the head and nails grow back.

At 38-40 weeks, all mothers expect a birth. This can happen anytime. The child drops and mom becomes easier to breathe. A woman carefully monitors the passage of the mucous plug and the appearance of contractions.

And finally, it all happened! Mom and baby are together now. The baby is still very small, but full of energy to learn a new world. Now his status is a newborn.

Table of fetal development by week of pregnancy

This article gives a full description of how intrauterine development of a child occurs by week. The table below will serve as a kind of conclusion to all of the above and will serve as a reminder for the future mother.

  Intrauterine development of the fetus by week of pregnancy

Pregnancy in weeks	Fruit length, cm	The weight of the fetus, g	Development of organs and systems
4	0,1		Ovum fertilization, implantation, embryo and embryo.
5	0,15 - 0,2		Bookmark the liver, pancreas, upper respiratory system, heart.
6	0,4 - 0,6		The emergence of primordial limbs, listening to the heartbeat, the neural tube closes, parts of the larynx and middle ear are formed.
7	0,7 - 0,9		The trachea, esophagus, small intestine, adrenal glands and sternum develop. The brain is actively forming.
8	0,9 - 1,2		The embryo clearly distinguishes between body and head, equivalent in size. The rudiments of the nose, eyes, mouth and organs of the reproductive system are formed.
9	1,3 - 1,5	1	The cerebellum develops, fingers form on the limbs.
10 - 11	2,7 - 3,5	4	Joints, upper lip, auricles, external genitalia, and rudiments of milk teeth develop.
12	9	20 - 25	A face is formed, the intestines contract, the liver produces bile, and the baby moves.
13	10	28	The limbs are fully formed. The pancreas produces insulin.
14 - 15	12,5	50 - 90	The excretory system is active, the child produces urine.
16	16	120	We distinguish the sex of the fetus. The skin is very thin, muscles are formed. The child does not move so randomly, mom feels the first tremors.
20	25	280 - 300	The baby's skin has a fluff and a cheese-like lubricant. The intestine forms the original feces. The child is able to hear.
24	30	600 - 800	Renal function is activated, the fetus is dynamically gaining weight.
28	35	1200	The muscles and reproductive system of the child are formed.
32	40	1500 - 1600	There is an active development of the senses and the nervous system: the baby is able to see the light and feel the taste.
36	45	2400 - 2500	The child quickly gains weight, its activity decreases.
40	50-52	3200 - 3500	The kid is ready for the birth of the world.

Of course, it is best to study this information when pregnancy is only planned. Then a woman has more chances to properly organize nutrition, regimen, intake of necessary vitamins and minerals. However, information about the intrauterine development of the baby will always be timely and interesting for the expectant mother, regardless of the duration of her pregnancy.