Baby development by week of pregnancy

2024 Author: Priscilla Miln | [email protected]. Last modified: 2023-12-16 00:21

Every mother is interested in the development of the child by weeks. After all, the expectation of a baby is a great happiness that completely changes the life of future parents. Therefore, it is very important for a woman to know what is happening inside her every week of her life.

How does the conception of the fetus occur?

At the stage of fertilization, the egg begins to break up, also reaches the uterus and gets rid of the shell. Immediately after fertilization of the egg, an embryo is formed. The embryonic stage is the first stage of intrauterine development. An embryo is a fetus that does not yet have systems and types of organs.

• First week. On the 7-8th day after fertilization, a process called “implantation” takes place. The egg settles on the site of the uterus, using chorionic villi, attached to the mucous membrane of the female genital organ.
• Week two. From the second week of pregnancy, a significant stage begins. The fetus begins to develop, muscle, bone tissue and the nervous system are formed. By the second week, the fetus is already separated from the shell.
• Third - fifth week. The fetus develops more strongly, vital organs begin to form: heart, head, arms and legs, tail. Gill slit appears. The length of the embryo at the fourth week is up to 6 mm.

Fetus 6 to 10 weeks

The development of the baby in the womb for weeks 6-10 will be as follows:

• 6 week of fetal development marks the perfection of the brain of the embryo. The coordination of the work of the heart and skeletal muscles begins. Blood cells are formed in the liver. The placenta gradually increases in size to provide the baby with the necessary nutrients.
• The process of body formation takes place at the 7th week of pregnancy. The face takes on human features. In the heart there is a division into 4 chambers and the formation of blood vessels. The size of the child reaches 15-17 mm. Begins to move a lot, but this is not noticeable to the mother.
• 8 and 9 weeks are characterized by sufficient activity of internal organs and development of the brain. The nervous system responds to conditions from the external environment. More distinct limbs and joints.
• At the 10th week, the development of the reproductive system begins in the child, since the vital organs and the body itself are almost completely formed.

Week 11-15

Child development by week (photos on this topic are presented in the article) the following:

• Eleventh week. At this time, it is necessary to undergo an ultrasound screening, with the help of which the parameters of the child are determined, such as: nasal bones, thickness of the collar space, etc. The size of the child is 7 cm. There are changes in body proportions, the appearance of teeth and the development of a grasping reflex.
• Developmentbaby at 12 weeks. At this moment, the size of the child is 9 cm, and the weight is 20 grams. The chance of correctly determining the sex of the child is more than 50%. The child at this time begins to move his limbs. White blood cells appear in the circulatory system, protecting the body from infections. At this time, mom adds about 1-2 kg in weight.
• Thirteenth week. The size and weight of the baby slightly increase, the height is 10 cm, and the weight is 30 grams. By this time, the necessary organs have been formed inside the body, but after that they only develop. The face takes on human forms, but the head is still disproportionate to the body.
• Fourteenth week. At this time, the length and weight of the fetus reach 13 cm and 45 grams, respectively. In boys, a prostate develops, and in girls, the ovaries begin to descend. The baby imitates breathing so that at birth it begins to breathe. The production of insulin and the work of the pituitary gland begins.
• Fifteenth week. At this time, the size of the fetus does not change, but the weight increases to 50-70 grams. The child at this point is covered with hairs that serve to keep warm, changes position. The baby is constantly moving, but hitting the uterus.

Week 16-20

Development of the baby in the womb by week (within a month):

• At the 16th week of pregnancy, the skeletal bones of the fetus harden, but remain quite flexible. In girls, sex cells are formed this week. The baby began to hear, because the auditory formation was completed. The body is covered with a protective fluff,which will protect the baby until birth. The weight of the child at this stage of development reaches 110 grams, and the height is 11-14 centimeters.
• At 17 weeks, the baby reaches a height of 13-15 centimeters. The skin becomes pink, and the facial features are similar to human ones. The fetus begins to actively move and push. The emotional state of the child directly depends on the state of the mother. If the mother is nervous and worried, then the baby will push harder.
• At the 18th week of pregnancy, development is fast. The fruit reaches the size of a palm. He can already blink and open his mouth. Most of the time the baby sleeps, which means that movements stop for this time. The weight of the baby at this stage is about 190-200 grams.
• At the 19th week, the growth of the fetus slows down significantly. The rudiments of teeth are formed in the baby, the respiratory system is more improved. Movements become frequent and noticeable. The weight of the child increases to 300 grams, and the height is up to 23 centimeters.
• At 20 weeks, the baby's head begins to be covered with the first hair. The fetus increases in size up to 25 centimeters. At this time, the eyes are formed, the blinking effect appears. Baby's weight increases to 340 grams.

Development of the baby in the womb from 21 to 25 weeks

21 - The 25th week of pregnancy is a turning point in the development of normal embryonic development. At this stage, the digestive system changes - most of the nutrients, penetrating through the placenta, contribute to the formation of tastepreferences of the baby, when opening the mouth and swallowing the amniotic fluid, the child easily digests it.

The development of the baby by week of pregnancy is as follows:

• 21st week. Weight - 400 grams, height - 25 cm. The final maturation of the digestive system occurs. A child tastes.
• 22nd week. Weight - 500 grams. Height 26 cm. The skin ceases to be transparent, but remains red and wrinkled. There is a further formation of the nervous system, the formation of brain structures.
• 23 - 25 weeks. The main stage for determining mental performance, since the size of the GM increases by 5 times. Cortical and subcortical structures appear, the cortex begins to form.

Development from 26 to 30 weeks

26 - The 30th week of pregnancy is characterized by the abrupt development of the embryo and its preparation for an independent isolated life cycle.

• 26th week. Active formation of the respiratory system. The lungs are filled with a special fluid that will allow the baby to take its first independent breath at birth.
• 27th week. The nervous system undergoes significant changes. This is expressed in the appearance of phases of sleep and wakefulness, which may not coincide with the maternal ones. The movements of the child are becoming more active due to hormonal changes.
• 28th week. The baby's glottis begin to vibrate, preparing the baby for the first cry. Therefore, during this period, the mother's body can perceive a “hiccupping” uterine sound,similar to the croaking of frogs or hiccups.
• 29th week. The fetus begins to open its eyes, distinguish light, taste. The child develops certain habits and behaviors. Throughout this period, the expectant mother is completely subordinate to the nature of her own child, his reaction to external influences.
• 30th week. The baby begins to actively gain weight, trying to get more subcutaneous fat to ensure thermoregulation outside the mother's womb. It is believed that it is at this stage of development that the child can completely separate from the parent, since all life support systems are configured to work independently.

Week 31-35

31 - 35 weeks of pregnancy is a very important stage in the development of the embryo, because it will soon be born. And this means that growth and development are coming to a logical conclusion.

• 31st week. The weight of the fetus is 1600 grams, height - 40 cm. In boys and girls, sexual characteristics begin to clearly take shape. The expectant mother's weekly weight gain is normally 300-400 grams.
• 32nd week. The child has formed sexual characteristics of the sex, the internal systems and organs function. The exception is the lung structure, which takes longer to fully mature.
• 33rd week. The weight of the baby is about 2 kilograms, height is at least 44 centimeters. He is actively moving, trying to establish contact with his mother. Responds to changes in the external environment, perceives sounds.
• 34 – 35weeks. This period is called "preparatory". The original lubricant that covers the fetus begins to thicken, the child begins to move, taking the correct position for the birth. Birth weight is 2.5-4 kg, height is 47-56 cm.

Week 36-39

From 36 to 40 weeks the baby is already formed. The internal organs are ready for independent life outside the womb. The baby's head descends into the mother's pelvis. The skull of the baby is not completely ossified, a fontanel remains between the bones. The structure of the skull allows the baby to pass through the birth canal of the mother. Developed reaction to light and sounds.

From the 36th week, the individual features of the child appear, ears are formed, gaining weight and muscle mass. The child's skeleton becomes stronger every day. The baby prepares to suckle the breast, exercising on the fingers.

At 39 weeks, the skin is smooth and pink, the baby turns his head and lifts, the hair is silky.

Birth

By 40 weeks the fetus becomes crowded, reflexes are formed, about 60-70 reflex, automatic movements. The size of the fetus is 50-55 cm, and the weight is 3000-3500 grams, the child turns over. By the end of the 40th week, labor occurs, in some cases later than the 40th week.