Fetus
Women carry the fetus within the uterus for nine months before birth, in which the fetus grows continuously from one cell until it becomes a full-grown person in the ninth month. Experts say that each fetus develops in the uterus in a different way than others, but there are some stages that can be During which the development of the fetus within the uterus.
Fertilization
The process of fetal development begins with the formation of the fetus, which is done by the process of fertilization, which occurs in the first three weeks of pregnancy, after the process of fertilization of the egg itself, and then called zygote, and then begin to divide into the cells of the type (stem) and on its way to the uterus.
Stages of fetal development
After fertilization, the stages of fetal development are as follows:
- fourth week
This week, the size of the stem cells that began to divide the size of the apple seed, and is divided into three sections, and consists of the first layer after the brain, the spine, spinal cord, nerves, and the second layer, which form the heart and circulation, and the third form the lungs Intestines and urinary tract, and the process of transferring oxygen and food to the fetus through the umbilical cord.
- The fifth week
The fetus’s heart starts beating. The fetus is about half a centimeter long. This week, the fetus develops a sudden growth phase in which most of the body’s organs are formed. The hands, mouth, facial features, neck, etc. are closed and the neural tube that connects the spinal cord to the brain closes.
- the sixth week
The size of the fetus this week is the size of the lentil, the head size is larger than the body, and the heart is divided into two cavities.
- Seventh week
The fetus is about a centimeter long and about a quarter, and the toes and hands begin to appear.
- The eighth week
This week, the muscles and nerves begin to function, and the uterus expands to accommodate the fetus, which is longer than 1.5 centimeters.
- Week Nine
This fetus weighs about two grams this week, and this week the eyelids are applied to the eyes, the inner structure of the ears is completed, and the genitals begin to form.
- Week 10
The fetus’s length this week is about three centimeters and four grams, and vital organs are also formed this week and can function.
- Week Eleven
The fetus is approximately four centimeters long, and the fetus begins to kick and move slightly, and its members have fully grown.
- Twelfth week
The fetus is more than five centimeters long and weighs about 14 grams. The face takes on more human features. The eyes close together and the ears settle in place.
- Week 13
The fetus is about seven centimeters long and twenty-three grams long and consists of fingerprints.
- Week Fourteen
The fetus is about nine centimeters long and more than 40 grams, and the body begins to grow faster than the head, and the fetus at this stage close the fist of his hand and some movements in the face.
- Fifteenth week
The fetus reaches about nine centimeters and seventy grams, and the external genitalia begin to appear.
- Week Sixteen
The embryo becomes the size of the green pepper and weighs about 100 grams.
- Fourth month
The fetus continues to grow until it reaches about 14 centimeters and is covered with feces, and this month the mother can hear the heartbeat of the fetus inside the womb and can feel the baby’s kicking.
At the end of the month, the fetus is 19 centimeters long and 340 grams, and it coats and protects the fatty layer called the fetal genotype this month.
- The sixth month
The fetus is 38 centimeters in length this month, and the baby starts breathing in the lungs, and the fetus can hear the mother’s voice this month.
The fetus is about 45 centimeters long, and its body is fully completed, and the nails also cover the fingers.
At this stage, the fetus is 1.8 to 2.7 kilograms, and the lipid layers begin to form under the skin, and it can manage its head downwards in preparation for delivery.
The weight of the fetus is between 2.7 and more than four kilograms, and about 50 centimeters long, and the uterus becomes tight this month, indicating that the birth is near.