The breast is a gland consisting primarily of connective and fatty tissues that support and protect the milk producing areas of the breast. The milk is produced in small clusters of cells called alveoli. The milk travels down ducts to the nipples.
Breastfeeding success has nothing to do with the size of your breasts or nipples. Breast size is an inherited trait and determined by the number of fat cells you have. The breasts will enlarge with pregnancy and breastfeeding. Breastfeeding is a supply-and-demand process. Therefore, the more you nurse, the more milk you produce!