Human Milk Production: How Does Breastfeeding Work?

Did you know your body gets ready for breastfeeding before you even give birth? While you are pregnant, your breasts change. These changes allow your breasts to make milk and may cause them to feel fuller and more tender. Once your baby is born, their suckling releases hormones in your body that cause your breasts to make and release milk.

Milk production occurs within the alveoli, which are grape-like clusters of cells within the breast. Once the milk is made, it is squeezed out through the alveoli into the milk ducts, which resemble highways. The ducts carry the milk through the breast.

The size of your breasts does not affect your ability to breastfeed. Women with small breasts make the same quantity and quality of milk as women with larger breasts.