Puberty | Center for Young Women's Health - Breast buds as sign of puberty
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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 Breast development is caused by hormones released by the ovaries at puberty. is slight swelling under the nipple, a stage of development called breast buds.