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Stages of Development in Adolescent Males
Stage 2
Growth
Puberty marks the beginning of this stage, though outward signs do not appear immediately. During this stage growth continues at a rate of about two inches (5 to 6 cm) per year.
Gentials
Scrotum begins to swell and reddens color. Skin of the scrotum becomes thinner. Testes are between 1 and 1 1/4 inches (2.5 to 3.2 cm) measured along the long axis or 1.6 to 6 ml in volume.
Penis begins increasing in both length and width a bit. Spontaneous erections begin in this stage.
Hair
Fine, lightly pigmented (downy) hairs form around the base of the penis and under the arms.
Body
A ring (the areola) forms around the nipples on the chest.
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