Flexi Says: An example of positive feedback is milk production by a mother for her baby. As the baby suckles, nerve messages from the nipple cause the pituitary gland to secrete prolactin. Prolactin, in turn, stimulates the mammary glands to produce milk, so the baby suckles more. This causes more prolactin to be secreted and more milk to be produced. This example is one of the few positive feedback mechanisms in the human body. If it is controlled by a negative feedback mechanism, milk production would be a mechanism that regulates itself depending on the amount of milk produced, so that the amount of milk remains constant. This will not allow the production of more milk needed for a growing baby.