Lactation is the process of milk secretion by the mammary glands after the mother has given birth. However, there are some situations when women who already gave birth many years ago experienced lactation after suckling a baby. Several endocrine hormones have been studied to be responsible for such mechanism. Particularly, the stimulation when the child is nursing enhances prolactin secretion which is vital in milk formation. The suckling further triggers the release of oxytocin (hyperlink) which is responsible for milk flow and expulsion.