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n. the secretion of milk by the mammary glands of the breasts, which begins normally at the end of pregnancy or may be pathological (see galactorrhoea). A fluid called colostrum is secreted before the milk is produced; both secretions are released in response to the sucking action of the infant on the nipple. Lactation is controlled by hormones (see prolactin, oxytocin); it stops when the baby is no longer fed at the breast.

Subjects: Medicine and Health.

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