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 development starts. It is a normal monthly process where the uterine lining is shed if an egg is not fertilized. The first visible sign of puberty in most
: For girls, the primary hormone is estrogen , while for boys, it is testosterone .
The first sign of puberty in boys is usually the enlargement of the testicles. It is a normal monthly process where the
: Hips widen, and there is an increase in body fat around the stomach and buttocks.
National Institutes of Health (.gov)https://www.ncbi.nlm.nih.gov Physiology, Puberty - StatPearls - NCBI Bookshelf : Hips widen, and there is an increase
: Growth of pubic and underarm hair, a clear or white vaginal discharge, and a rapid growth spurt. Physical Changes in Boys