Girls only: , ovaries start making oestrogen and progesterone, , breasts develop and get bigger, external genitals (vulva) start to grow, puberty happens between ages 10-14, Boys only: testes start making testosterone, , hair may start growing on chest and back, the voice starts to break and get deeper, erections start to happen, external genitals (penis and testes) get bigger, chest and shoulders get broader, puberty happens between ages 12-16, , , , Both Girls and Boys: , , glands make hormones that stimulate changes changes body, hips get wider and body becomes more curvy, , pubic hair grows around genitals, , more hair starts growing on arms and legs, , , , ,

Puberty

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