The stages of pregnancy development in weeks

The woman carries the fetus for up to nine months, ie, approximately forty-one weeks. In this period, there are many changes for the fetus and the body of the pregnant woman. These include:

First trimester of pregnancy

First week: The first day of the menstrual cycle.
Week Two: Ovulation begins.
The third week: the week in which the woman is sure to carry it, and the egg cell turns into a ball wrapped in hundreds of hollow cells, filled with fluid.
Week 4: Embryo implantation of the uterine wall, and the surrounding fetal membranes form the placenta.
Week 5: The fetus grows and grows larger, and begins to form the brain, heart and spinal cord of the fetus.
Week 6: The heart of the fetus begins to pulse, and the appearance of its facial features.
Seventh week: the growth of the face of the fetus, and the lenses of the eye, and the appearance of the hands and feet slightly.
Week 8: The fingers of the hands and feet begin to appear, and the appearance of the eyes.
Week 9: Fetal growth of the fetus, eye eyelids, grow ears.
Week 10: Neck growth of the fetus, slightly rotating, and can close eyes to protect them.
Week 11: Fetal growth, has a face like a human face.
Twelfth week: The heartbeat of the fetus can be heard, and its size increases, and this week the end of the first third of the fetus’s age.

Second trimester

Thirteenth week: The bones of the head, arms and feet are formed, and the fetus can form and dispose of urine in the surrounding fluid.
Week Fourteen: Complete arm growth, identification of fetal sex.
Week 15: The skeleton of the fetus.
Week 16: The fetus begins to move its eyes slowly.
Week 17: The process of storing fat under the skin, which provides energy.
Week 18: The fetus can hear sounds.
Week 19: It is a fatty layer to protect the skin of the fetus, and the uterus in the female fetus.
Week 20: The fetus begins to move.
Week 21: Can swallow fetus, to gain more weight.
Week Twenty-two: the body of the fetus hair soft.
Week 23: The eyes of the fetus begin to move quickly, and consists of the fingerprints of the hands and feet.
Week 24: Hair growth on the fetal head, the fetus can sleep and wake up.
Week 25: The fetus can respond to its familiar sounds.
Week 26: Fingernails are fully formed.
Week 27: Growth of the lung and nervous system.
Week 28: Fetal eyelashes are formed, and the weight increases.

Third trimester of pregnancy

Week 29: The growth of fetal bones fully, but they will be soft.
Week 30: Hair growth, and the fetus can open its eyes to the dead.
Week 31: Complete growth of the nervous system.
Week 32: The fetus tries to breathe.
Week 33: The fetus can distinguish light and darkness.
Week 34: Growing and growing.
Week 35: Continue to gain weight to 225 grams.
Week 36: Many kicks are done by hands, feet and feet because of its size.
Week 37: Complete growth of all body organs.
Week 38: The fetus may weigh up to 400 grams.
Week 39: Placenta transfers substances to the fetus called anti-protective substances.
Week 40: The weight of the fetus is 460 grams, and the next week is the date of birth.