Girls usually begin puberty between the ages of 8 and 13 years old. The earliest sign of puberty in most girls is the development of breast "buds.
Breast development, or the growth of a girl's breasts, is often the first sign of puberty for females.
From a healthcare professional: I have a six year-old girl with breast buds. How much of an evaluation is necessary? The onset of breast development in girls.
Breast development happens in certain stages during a woman's life: first before birth, and again at puberty and later during the childbearing years. Changes.
Find out when and how your breasts start to develop during puberty. If a girl's breasts start to develop at a younger age, this doesn't mean she'll have bigger.