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The breast is an organ on the lower chest area of humans and primates. Humans have two breasts. Both males and females have breasts at birth. However, during puberty, the breasts of women become larger and more visible. Breasts have mammary glands that produce milk and are used in breastfeeding to allow a baby to drink milk from them.
Men also have breasts and mammary glands, but they are usually much smaller and underdeveloped. In rare cases men can also produce milk, but normally they don't have the proper hormones present for that to actually happen.