These allow more room for the baby to pass. Before birth the baby drops in the uterus. Just before birth, contractions cause the amnion the break and the fluid around the baby comes rushing out. The ducts and milk glands develop during pregnancy in response to the high levels of estrogen and progesterone. These hormones also trigger the release of prolactin from the pituitary that stimulates milk production.
Milk is released into the ducts of the breast by the hormone oxytocin.
Oxytocin is released when the baby's suckling at the breast stimulates the release of oxytocin from the pituitary. 100,000 women develop breast cancer each year. It spreads via lymph vessels. The cure rate is good if there is early detection. The best detection method is self-examination.