Wiktionary
breast milk
n. milk produced by human mammary glands.
Wikipedia
Breast milk
Breast milk is the milk produced by the breasts (or mammary glands) of a human female for her baby. Milk is the primary source of nutrition for newborns before they are able to eat and digest other foods; older infants and toddlers may continue to be breastfed, either exclusively or in combination with other foods from around six months of age when solid foods may be introduced.