When Do Breasts Start Growing?

Breasts can start growing as early as age 8 or as late as 13. Some girls' breasts grow slowly and others grow quickly. Some girls may feel like their breasts will never start growing. But it's just that girls start developing at different ages and different rates. One girl might have more developed breasts at 12, whereas her friend could be still flat as a board.


Breast development happens in stages. The first stage starts during the early part of puberty, when a girl's ovaries enlarge and estrogen, an important female hormone, begins to circulate in the body. Doctors often refer to the early stages of breast development as "breast budding." Get it? Budding — like a flower has buds.

A breast bud is like a small raised bump behind the nipple. After breast budding happens, the nipple and the circle of skin around the nipple (called the areola) get bigger and a little darker. Then the area around the nipple and areola starts to grow into a breast.

As breasts keep growing, they may be pointy for a while before becoming rounder and fuller. For some girls, one breast might be a little bigger than the other one. A girl's breasts may continue to grow during the teen years and even into her early twenties. Fully developed breasts come in all shapes and sizes.

Breast size gets a lot of attention and many girls may wonder how they can make their breasts grow faster or bigger. Despite what some magazine ads say, there isn't any magic cream or pill that can speed up the process or make a girl's breasts larger than they are. In fact, breast size is mostly determined by heredity and a girl's weight. So if a girl's mother has big breasts or small breasts, the girl can expect to have breasts of similar size. And a girl who has more body fat is more likely to have larger breasts.