: Puberty typically starts between the ages of 8 and 13 for girls and 9 and 14 for boys, though the exact timing varies for everyone. Physical Changes in Girls
: For girls, the primary hormone is estrogen , while for boys, it is testosterone .
: Hips widen, and there is an increase in body fat around the stomach and buttocks. : Puberty typically starts between the ages of
National Institutes of Health (.gov)https://www.ncbi.nlm.nih.gov Physiology, Puberty - StatPearls - NCBI Bookshelf
: Growth of pubic and underarm hair, a clear or white vaginal discharge, and a rapid growth spurt. Physical Changes in Boys National Institutes of Health (
The first visible sign of puberty in most girls is breast development, often starting as small, tender "breast buds" under the nipple.
Puberty is triggered by hormones from the brain that signal the reproductive organs—the ovaries in females and the testes in males—to begin producing sex hormones. : Usually begins about two years after breast
: Usually begins about two years after breast development starts. It is a normal monthly process where the uterine lining is shed if an egg is not fertilized.