During precocious puberty, testosterone from the testes produces primary and secondary sexual characteristics in a male child that include growth of the genitalia, deepening of the voice, and the appearance of body hair.

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Precocious puberty occurs when puberty starts before the age of 8 in girls and 9 in boys. In boys, testosterone from the testes can cause the growth of the genitalia, deepening of the voice, and the appearance of body hair, among other primary and secondary sexual characteristics.

During Precocious Puberty, Testosterone from the Testes Produces Primary and Secondary