The enlargement of the testes is often the first sign of puberty in boys.

Name: The enlargement of the testes is often the first sign of puberty in boys.
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Enlargement of the testes (also known as testicular growth) is usually the first visible sign of puberty in boys, typically occurring around the age of 9-14 years old. Other physical changes, such as pubic hair growth, voice deepening, and growth spurts, also occur during puberty in boys.

The Enlargement of the Testes Is Often the First Sign