Breast milk

The nipple is a raised region of tissue on the surface of the breast from which, in lactating females, milk from the mammary gland leaves the body through the lactiferous ducts to nurse an infant. The milk can flow through the nipple passively, or it can be ejected by smooth muscle contractions that occur along with the ductal system. The nipple is surrounded by the areola, which is often a darker colour than the surrounding skin.

milk produced by the mammary glands in the breast of a human female

thumb|On the left is breast milk of the human expressed on day 4 of lactation, and on the right is [[breast milk expressed on day 8. Colostrum gives the milk a yellowish hue.]] thumb|Bovine colostrum (beestings) next to spray-dried colostrum powder

Lactation describes the secretion of milk from the mammary glands in addition to the period of time that a parent lactates to feed her young. The process can occur with all sexually mature female mammals, although it may predate mammals. The process of feeding milk in all female creatures is called nursing, and in humans it is also called breastfeeding. Newborn infants often produce some milk from their own breast tissue, known colloquially as witch's milk.

manufactured food designed and marketed for feeding of infants

thumb|Baby being offered baby food Weaning is the process of gradually introducing an infant human or other mammal to what will be its adult diet while withdrawing the supply of its mother's milk. In the UK, weaning primarily refers to the introduction of solid foods at 6 months; in the US, it primarily refers to stopping breastfeeding.

Galactorrhea (also spelled galactorrhoea) (galacto- + -rrhea) or lactorrhea (lacto- + -rrhea) is the spontaneous flow of milk from the breast, unassociated with childbirth or nursing.

device for applying suction to breasts

service which collects, screens, processes, and dispenses by prescription human milk donated by nursing mothers not biologically related to the recipient infant;

medical condition

production of breast milk by a mother that is of insufficient quantity to meet the nutritional needs of her infant

milk secreted from the breasts of some newborn human infants of either sex

clinical sign to detect the presence of pus in breast milk

provision of nutrition to children in their first months of life