During pregnancy the placenta has a vital role in generating hormones to develop the milk making factory in the breasts. After the birth of your baby the placenta separates from the uterus and is expelled. This causes a sharp drop in the hormone progesterone which triggers the breasts to start milk production about 32-40 hours after birth.
Prolactin, Cortisol, Oxytocin and Insulin are hormones that are essential for the production of breast milk and are generated in a woman’s body throughout her pregnancy. The production of breast milk, however, is only triggered thirty to forty hours after birth. The hormone progesterone, which inhibits the production of breast milk, drops once after the baby is born and placenta separates from the uterus. This reduction in progesterone triggers the production of breast milk.