Physical features appearing at puberty that indicate the onset of adult reproductive life. In girls, breast enlargement is the first sign. Shortly afterwards, pubic and underarm hair appears, and body fat increases around the hips, stomach, and thighs to produce the female body shape. In boys, the first sign is enlargement of the testes, followed by thinning of the scrotal skin and enlargement of the penis. Pubic, facial, axillary, and other body hair appears, the voice deepens, and muscle bulk and bone size increase.
Sexual characteristics, secondary |
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