Milk synthesis is promoted by of the anterior pituitary gland. Estrogen and suppress milk synthesis by acting as prolactin antagonists. Once the is expelled, progesterone levels drop sharply, allowing prolactin to stimulate milk synthesis. After birth, baseline prolactin levels return to the pre-pregnancy state. When an infant , prolactin surges to stimulate milk synthesis. If the mother is not nursing the infant, prolactin surges and the mother stops synthesizing milk in about a week.

prolactin

progesterone

placenta

nurses

decline

Explanation:

milk is a  direct product of the synthesis of the mamary gland. prolactin is know to influence the reproduction system and it is situated in the pituitary gland as a hormone, influence the immune system and lactation process and other roles in the body.

progesterone is a  type of progestogen. in addition with estrogens, it is used majorly inn hormone therapy  especially low/little  sex hormone levels in some women.

The placenta is an organ that forms in the  uterus of females during pregnancy as it helps in oxygen and nutrients provisions  to growing baby in the womb and removes waste products from the baby's blood. nursing on the other hand deals generally with care