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Lactation describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young.

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This is when the breasts make colostrum (see below), a thick, sometimes yellowish fluid.In almost all mammals, lactation induces a period of infertility, which serves to provide the optimal birth spacing for survival of the offspring.When the baby sucks its mother's breast, a hormone called oxytocin compels the milk to flow from the alveoli, through the ducts (milk canals) into the sacs (milk pools) behind the areola and then into the baby's mouth It is also possible to induce lactation without pregnancy.Stress or anxiety can cause difficulties with breastfeeding.The release of the hormone oxytocin leads to the milk ejection or let-down reflex.At this stage, high levels of progesterone inhibit most milk production.It is not a medical concern if a pregnant woman leaks any colostrum before her baby's birth, nor is it an indication of future milk production.During this stage, the more that milk is removed from the breasts, the more the breast will produce milk.This is the mechanism by which milk is transported from the breast alveoli to the nipple.It can occur in males and females of many mammal species as result of hormonal imbalances such as hyperprolactinaemia.The chief function of lactation is to provide nutrition and immune protection to the young after birth.

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