Most girls have their growth spurt at a younger age than boys do. breasts, and the overall percentage of body fat increases in girls as they go.
10A would mean that the chest size is 80cm (32inches) and Measure round your body under your breasts - have the end.
How do breasts start to develop? The breasts get bigger and rounder as the fatty tissue By the age of 17, a girl's breasts will usually be fully developed, although this may take a bit longer.