Fetal development in the fourth month in detail

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 Fetal development in the fourth month in detail




Fetal development in the fourth month

The fourth month of pregnancy is considered the beginning of the second trimester. The fourth month is estimated to be the fourteenth, fifteenth, sixteenth, and seventeenth weeks. It should be noted that the fetus has undergone significant changes in this month of pregnancy, which will be explained in detail below.


Fourteenth week



The size of the fetus in the fourteenth week of pregnancy is about the size of a lemon, its length is about 8.7 cm and it weighs about 43 grams. In fact, the growth rate of the fetus's body is faster than the rate of head growth, 

but it is generally similar to the human body; Its neck is already molded and its arms are proportional to the rest of the body, 

but its legs are still a bit short at this stage because they are growing at a slower rate, and it is worth noting that at this stage of the fetus's formation the body and head of the fetus begin to have light hair, which is the type called this type of Fluffy hair, 

and the importance of this hair lies in regulating the temperature of the fetus's body; It helps to stick a waxy substance to the body of the fetus called the fetus, 

and the density of the fetal villi increases during the next six weeks of the fetus's life, but about four weeks before the date of birth, this hair falling out may leave a slight mark on the newborn after birth. As for the motor development of the fetus this week, 

it seems that it increases the coordination of the movements of the fetus’s arms and legs, and kicks or movements can be recorded when the mother is examined with an ultrasound device, 

and she may also be able to see these movements while the fetus may be able to move his fingers, but The mother cannot feel the movement of the fetus in the womb at this time, but she believes that the fetus may respond to the movement of the mother and react to it; For example, 

when she gently strokes her stomach, he may move, and as for the development of his facial features, the facial muscles are already starting to develop and the fetus has a frown-like feature on its face. For example, fetuses also begin to make slow movements in their eyes under closed eyelids.


At week 14, further fetal development includes:



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  • Heart: This week, the heart pumps about 32.5 liters of blood per day.
  • Fetal position: the fetus begins to take an upright position, where its muscles are strengthened and its bones are formed
  • The mouth and the digestive system: The roof of the mouth is developing this week, as is the activity of the digestive system, as the intestines secrete the so-called meconium, which is excreted as the main waste from the body of the newborn after birth. Boy.
  • Red Blood Cells: Red blood cells begin to form in the spleen of the fetus.
  • The gender of the fetus: The gender of the fetus may come out this week or in the next few weeks.
  • Toenails: Baby toenails begin to appear.
  • Genital organs: vesicles begin to form in female and male fetuses, and the prostate begins to appear.

Fifteenth week


In the fifteenth week, the length of the fetus reaches 9.5 cm and weighs about 80 grams, and the growth rate of the body is faster than the head, and in some cases, 

the mother may not feel the kicking of the fetus. Until the twenty-fifth week, in fact, the fetus began to hear this week, because the fetus can hear the faint sounds of the outside world, as well as the sound of the mother's digestive system, 

as well as the mother's heart and voice. . As for the development of vision in the fetus, his eyes become sensitive to light although his eyes were closed, 

he felt the bright light outside the mother’s abdomen, and the eyes approached the nose, and the eyebrows began to grow, and this week the fetus seemed to suffer from hiccups, in preparation for the breathing process, while the fetus’ 

The skin was still thin, you can see the bones and blood vessels in the course of talking about this, it shows that the bones, in general, are starting to harden; 

It transforms from cartilage (such as the cartilage that makes up the nose and ears) to a stronger bone, which can be identified on an X-ray. Finally, the fetus in the fifteenth week shows reflex responses such as sucking and swallowing.


Sixteenth week


The size of the fetus in this week of pregnancy is the size of an avocado, its length is 11.6 cm and it weighs the equivalent of 100 grams. The time to feel the kicks and movements of the fetus may vary according to the mother. 

In fact, during this week of pregnancy, the fetus begins to develop other things, including the facial muscles that begin to move, and facial features begin to appear, but it is important to know that the fetus does not control these Features or facial muscles in general, 

and the fact that the nervous system continues to develop this week, including allowing the reaction of the muscles of the fetus’s limbs, and the beautiful development that occurs at week 16: the ability of the fetus to link its hands together, 

and its ability to hold its hands together when Touch, his ability to tighten his grip, and how his hands can hold a rope around the work and efficiency of the heart; This week, it continues to pump the equivalent of 23.6 liters of blood per day, 

knowing that by the fortieth week of pregnancy, the fetus's heart will pump approximately 1798 liters of blood, and with developments this week the fetus can turn its head. The right direction raises, as for the skin of the fetus; It is still transparent At this gestational age, 

the fetus this week still does not have a lot of fatty tissue, which explains the long and thin appearance of the fetus, and in the development that also occurs in the sixteenth week, 

nails begin to grow and taste buds begin to develop obviously The last thing to note this week is that this week the baby's eyes are starting to move slightly and slowly and that his nose is actually where his nose was when he was born.


seventeenth week


During this week of pregnancy, the movement of the fetus begins to increase in the amniotic fluid surrounding the fetus, at this point the fetus's heart pumps approximately 47 liters of blood per day, which is equivalent to 140-150 beats per minute. 

The brain controls pregnancy As for skill-related development, it is mostly manifested in the increased intensity of sucking and swallowing skills, 

except that primitive responses at birth are well established at this stage. To move, close your eyelids, in fact, the amount of fat formed on the fetus increased this week, and it is important to note that fat is very important to give the fetus a feeling of energy and warmth at birth.


Among the other developments that the fetus is witnessing during this week of pregnancy, we mention the following:


  • Usually, the size of the head is proportional to the size of the fetus.
  • Fingernails and toenails grow to the tips.
  • The skin of the fetus is wrinkled and covered with a fatty layer, as described earlier.
  • The gallbladder begins to secrete the so-called bile, which is important and necessary for the digestion process in the body.
  • Blood cells begin to form in the bone marrow.
  • Urine begins to pass through the kidneys every fifty minutes and is actually an amniotic fluid that the fetus swallows.
  • The fetus's umbilical cord begins to gain thickness and strength.
  • If the fetus is female, an egg begins to form in the ovary.
  • The fetus's taste buds begin to distinguish between bitter, sour, and sweet.


The growth of the placenta is proportional to the needs, growth, and development of the fetus. In the context of this hadith, it should be noted that the placenta is responsible for nourishing the fetus and providing it with nutrients and oxygen, 

as well as getting rid of bodily waste; The placenta at this stage of pregnancy contains thousands of blood vessels that carry nutrients and oxygen from the mother's body to the fetus's body.