For others the growth is very quick. On average, it takes about 4 years for the breasts to develop fully, but some girls' breasts develop fully in less than a year, while other girls' breasts can take as long as 6 years to develop. So if your breasts are taking a long time to develop, be patient, it will happen. I don't mind having breasts, but I hope they do not grow extraordinarily big. At first I was wondering why they had delayed to come, but now I'm scared about the size.
Breasts come in all shapes and sizes.
The size and shape of your breasts are determined by the genetic traits that you inherit from your parents. The size is also determined by the amount of fatty tissues in the breasts. There is nothing you can do about what your breasts look like. No amount of exercise can increase your breast size. Exercise works by building up the muscles, and there are no muscles in the breasts.