For every normal woman, the awareness of her own pregnancy and the waiting period for the appearance of the baby are painfully sweet times. What happens at this moment in her body? Let's try to look into the womb ...
First week
So far, the baby is more of an idea than a real organism. Its prototype (more precisely, half the prototype) is one of many thousands of female eggs that are in their "cradle" - the ovaries. The second half of the prototype (paternal) has not even had time to take shape in a mature spermatozoon - this will happen in about two weeks. We are waiting, sir.
The second week
In the body of a woman, two important biological cycles occur almost simultaneously: ovulation - the appearance of a mature egg ready for fertilization; and during the endometric cycle, the uterine wall is prepared for the implantation of a fertilized cell. Both cycles are closely related to each other, because endometrial changes are regulated by hormones that are secreted in the ovary.
The third week
The egg and sperm met in the fallopian tube. As a result of their merger, a zygote was formed - the first and most important cell of the unborn child. All the subsequent 100 000 000 000 000 cells of his body are the daughters of the zygote! Three days after fertilization, the embryo consists of 32 cells and resembles a mulberry berry in shape. By the end of this week, the number of cells will increase to 250, the shape will resemble a hollow ball with a diameter of 0.1 - 0.2 mm.
Fourth week
The fetus is at the earliest stage of development, its growth can be from 0.36 to 1 mm. Implanted blastocyst plunged deeper into the mucous membrane of the uterus, and the amniotic cavity began to form. Here in the future will appear placenta and a vascular network containing maternal blood.
Fifth week
This week the fetus undergoes significant changes. First, its shape changes - now the kid no longer looks like a flat disk, but more like a cylindrical 1.5 - 2.5 mm long. Now doctors would call the baby an embryo - this week the heart will start beating!
Sixth week
Rudiments of the brain and limbs develop rapidly. The head assumes familiar outlines, eyes, ears appear. Inside the fetus, the simplest versions of internal organs are formed: the liver, lungs, etc.
Seventh week
At this same period of pregnancy, the inner ear of the baby is formed, the outer ear develops, the jaws are formed, and the rudiments appear. The baby has grown - its length is 7 - 9 mm, but most importantly - the baby starts to move!
Eighth week
The kid has become quite like an adult. The heart beats, the stomach produces gastric juice, the kidneys begin to function. Muscles contract under the influence of impulses coming from the brain. By the blood of a child, you can determine its Rh-belonging. Fingers and joints formed. The face of the baby acquires its own features, the facial expression begins to reflect what is happening in its environment. The child's body reacts to the touch.
Ninth week
The length of the baby from the crown to the sacrum is approximately 13-17 mm, weight - about 2 g. There is an intensive development of the brain - this week begins the formation of the cerebellum.
The tenth week
The length of the baby from the crown to the sacrum is approximately 27-35 mm, weight - about 4 g. The general parameters of the body are laid, the fingers are already separated, the taste bud and tongue appear. The tail is gone (it disappears this week), the brain continues to evolve. The heart of the embryo is already formed.
The eleventh week
The length from the crown to the sacrum is approximately 55 mm, weight - about 7 g. The intestine starts working, carrying out contractions reminiscent of peristalsis. This week marks the end of the embryonic period: henceforth the future child is called the fruit.
Twelfth week
The length from the crown to the sacrum is approximately 70-90 mm. Weight - about 14-15 g. The liver of the baby is already beginning to produce bile.
Thirteenth week
The length from the crown to the sacrum is 10.5 cm. Weight is about 28.3 g. All twenty of the milk teeth have formed.
Fourteenth week
The length from the crown to the sacrum is 12.5 - 13 cm. Weight - about 90-100 g. This week is important for internal organs. The thyroid gland is sufficiently formed to produce hormones. The boy appears prostate, in girls the ovaries descend from the abdominal cavity to the hip region.
Fifteenth week
The length from the crown to the rump is 93-103 mm. Weight - about 70 on the head of the baby appear hair.
Sixteenth week
The length from the crown to the sacrum is 16 cm. Weight is about 85 g. Eyebrows and eyelashes appear, the child already holds the head straight.
Seventeenth week
The length from the crown to the sacrum is 15-17 cm. Weight is about 142 g. No new structures were formed this week. But the kid learns to use everything that he has.
Eighteenth week
The total length of the baby is already 20.5 cm. Weight is almost 200 grams. The strengthening of the fetus bones continues. Phalanges of fingers and toes are formed.
Nineteenth week
Growth continues. This week, the fruit weighs about 230 grams. If you have a girl, she already has primitive eggs in her ovaries. Formed already are the rudiments of permanent teeth, which are located deeper than the rudiments of infant teeth.
Twentieth week
The length from the crown to the sacrum is about 25 cm. Weight is about 283-285 g. The original grease is formed - a white fatty substance protecting the skin of the baby in the uterus
Twenty-first week
The length from the crown to the sacrum is about 25 cm. Weight is about 360-370 g. The fruit freely moves inside the uterus. The digestive tract is already able to separate water and sugar from the baby's swallowed amniotic fluid and pass its fibrous contents right up to the rectum.
Twenty-second week
The fruit weight is about 420 grams, and the length is 27.5 centimeters. The fetus continues to grow and prepare itself for life outside the uterus.
Twenty-third week
The length from the crown to the sacrum is about 30 cm. Weight is about 500-510 g. The child continues to swallow small amounts of the surrounding fluid and remove it from the body in the form of urine, the child accumulates meconium (original feces).
The twenty-fourth week
The length from the crown to the sacrum is about 29-30 cm. Weight - about 590 - 595 g. In the skin, sweat glands are formed. The baby's skin thickens.
Twenty-fifth week
The length from the crown to the sacrum is about 31 cm. Weight is about 700-709 g. The intensive strengthening of the osteoarticular system continues. The sex of the child has finally been determined. The testicles of the boy begin to descend into the scrotum, and the girls form the vagina.
Twenty-sixth week
The length from the crown to the sacrum is about 32.5-33 cm. Weight is about 794 - 800 g. This week the child is already gradually opening his eyes. By this time they almost completely formed.
Twenty-seventh week
The length from the crown to the sacrum is about 34 cm. Weight is about 900 g. Your baby's skin is very wrinkled due to swimming in the amniotic fluid. Since this week, the child's chances of surviving in the case of preterm delivery are 85%.
The twenty-eighth week
The length from the crown to the sacrum is about 35 cm. Weight is about 1000 g. Now the baby uses the whole set of feelings: sight, hearing, taste, touch. His skin thickens and becomes more like the skin of a newborn.
Twenty-ninth week
The length from the crown to the sacrum is about 36-37 cm. Weight is about 1150-1160 g. The child begins to regulate his own temperature, and his bone marrow is fully responsible for the production of red blood cells of blood. The child urinates about half a liter of urine in the amniotic fluid daily.
Thirtieth week
The length from the crown to the sacrum is about 37.5 cm. Weight is about 1360-1400. The child is already beginning to train his lungs, rhythmically lifting the chest, which sometimes results in hitting the amniotic fluid in the wrong throat, causing hiccups.
Thirty-first week
The length from the crown to the sacrum is about 38-39 cm. Weight - about 1500 g. In the alveolar sacs, a layer of epithelial cells appeared, which produce surfactant. This surfactant spreads the lungs, allowing the child to draw in air and breathe independently. Because of the increase in subcutaneous fat, the baby's skin does not seem red, as before, but pink.
Thirty-second week
The length from the crown to the sacrum is about 40 cm. Weight is approximately 1700 g. The baby has a subcutaneous fat tissue, the pens and legs become plump. There is a bookmark of the immune system: the baby starts receiving immunoglobulins from the mother and intensively forms antibodies, which will protect it in the first months of life. The volume of amniotic fluid surrounding the baby is one liter. Every three hours they are completely updated, so the baby always "swims" in clean water, which can be swallowed without pain.
Thirty-third week
The length from the crown to the sacrum is about 42 cm. Weight is about 1800. By this time the child has already turned head down: he is preparing for the birth.
Thirty-fourth week
The length from the crown to the sacrum is about 42 cm. Weight - about 2000. The hair on the child's head became much thicker, the baby has almost dropped the embryo puff, but the layer of the original grease becomes even more abundant.
Thirty-fifth week
The length from the crown to the sacrum is about 45 cm. Weight is about 2215 - 2220 g. This week the child's nails are already grown to the very edge of the fingers. The deferring of fat tissue continues, especially in the forehearth region: the baby's shoulders become round and soft. Pushok-lanugo gradually departs from it.
Thirty-sixth week
The length from the crown to the sacrum is about 45-46 cm. Weight is about 2300 g. From the ninth month of pregnancy the baby daily adds in weight from 14 to 28 g per day. In his liver, iron accumulates, which will help blood formation in the first year of the larvae on earth.
Thirty-seventh week
The length from the crown to the sacrum is about 48 cm. Weight is about 2800 g. The fat deposits continue to accumulate at a rate of 14 grams per day, and the formation of the myelin layer of certain neurons of the brain is only just beginning (it will continue after birth).
Thirty-eighth week
The length from the crown to the sacrum is about 50 cm. Weight is about 2900 g. The child now adds 28 grams per day. Usually at 38 weeks his head goes down to the entrance to the small pelvis.
Thirty-ninth week
The length from the crown to the sacrum is about 50 cm. Weight is about 3000 g. The nails on the legs have grown completely.
Fortieth week
The birth of a child at a period of 38-40 weeks is the norm. By this time the usual length of the newborn is 48-51 cm, and the average weight is 3000-3100 grams.
Forty-first and forty-second weeks
Only ten percent of women do it before this time. For the baby it is absolutely harmless - it only adds weight.