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Here is a simplified checklist of what occurs during the different stages of puberty for boys:
Stage I
- Prepubertal appearance
- Testicular volume less than 1.5 ml
- Penis 3 cm or smaller
Stage II
- Small amount of light downy hair at the base of the penis and scrotum
- Scrotum skin thins
- Testicles continue to enlarge (up to 6 ml)
- Scrotal enlargement begins
- Penis size remains unchanged
Stage III
- Pubic hair begins to darken and become more coarse
- Pubic hair begins to extend from just above penis to more of a triangle shape
- Testicular size around 6-12 ml
- Scrotum continues to enlarge
- Penis begins to enlarge, first in width, then in length (up to about 6 cm)
- Due to increased hormone secretion, 70% develop breasts temporarily
Stage IV
- Pubic hair has quality of adult, but has not extended to the legs
- Testicular volume about 12-20 ml
- Scrotum continues to enlargen
- Scrotum begins to darken in color
- Penis continues to enlarge, first in length (up to about 10 cm), then in width
- Due to increased hormone secretion, 70% develop breasts temporarily
Stage V
- Pubic hair extends to medial thigh
- Testicular volume 18-20 ml or larger
- Adult sized and colored scrotum
- Penis length around 15 cm
- Gynecomastia, if present, regresses
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