check the tag FEMALE usually but occasionally MALE; "postpartum amenorrhea" is indexed under PUERPERIUM + AMENORRHEA and not LACTATION unless lactation is particularly discussed; ANIMALS, SUCKLING is available but the suckling of an animal goes here: human suckling goes under BREAST FEEDING

The processes of milk secretion by the maternal MAMMARY GLANDS after PARTURITION. The proliferation of the mammary glandular tissue, milk synthesis, and milk expulsion or let down are regulated by the interactions of several hormones including ESTRADIOL; PROGESTERONE; PROLACTIN; and OXYTOCIN.

LACTATION, PROLONGED was heading 1975-96 (see under LACTATION 1975-90)