See below: Increase in genital size, development of pubic and axillary hair, voice change, increase in muscle mass, and growth spurt.
Answered 9/11/2016
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Puberty in boys: The primary sign is testicular enlargement. This could precede secondary characteristics like pubic hair, body odor, acne, oily skin, growth spurt, moodiness, by at least a year.
Answered 10/24/2017
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