The breasts are two prominent, reproductive organs located at the top of the torso in females. Inside the breasts are the mammary glands. The name “mammary glands” comes from the word for “breasts” in latin: mamma. Breasts secrete milk that can be used to breastfeed an infant after pregnancy; however, breasts also have a sexual function. There are two hormones that directly stimulate the process of breastfeeding: oxytocin and prolactin. Estrogen, another hormone, also plays a role in breastfeeding, but in a more indirect way. When a baby suckles on the nipple, the mother’s brain releases oxytocin and prolactin, which triggers the production of milk in the alveoli. Men also have breasts and mammary glands, although they’re much smaller than female breasts in healthy men. Hormonal disorders can trigger milk production outside of pregnancy in both males and females.