What is the milk hormone and where is it made?
Prolactin is a hormone that has an important role in supporting milk production. Known as the “milk hormone,” it is made in the pituitary, a gland at the bottom of the brain. Prolactin levels rise during pregnancy and gradually decrease after the baby’s birth, while spiking every time the baby breastfeeds. The hormone seems to allow milk to be made but doesn’t control the amount that is made. Mothers who breastfeed exclusively tend to have higher levels of prolactin than those who give milk supplements or those who express. Prolactin also causes changes in the mother's body to support the energy needs of pregnancy and breastfeeding. The pituitary can develop problems that can affect milk production.