A child is born through a woman’s vagina. Sperm and egg cells combine to form a fertilized egg, which is implanted in the woman’s uterus and undergoes continuous cell division to form an embryo. It then gradually develops into a fetus over a period of 37-40 weeks and goes into labor at full term. The lower part of the uterus and cervix ripens due to estrogen, contractions, and prostaglandins. Through the action of contractile forces of the uterus, diaphragm, and abdominal muscles, through a series of adaptive rotations, the fetus passes through the birth canal in the smallest possible path until it is finally delivered. With the advancement of medical technology, there are also some pregnant women who opt for a cesarean section for delivery. The formation of a child is a very complex process, usually around ten months each organ will gradually mature, the mother’s water breaks before the natural birth.