Answer:
Here is a simplified list of different changes that will occur during puberty:
In Males:
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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In Females
Stage I
- No pubic hair at all
- Prepubertal appearance
- No breast gland tissue present
- Areola is not elevated above skin of the chest
Stage II
- Small amount of long downy hair beginning to grow on labia majora
- Breast buds form
- Small area of glandular tissue in breast is present
- Areola begins to get larger
- Menarche often occurs in late stage I or in stage II
Stage III
- Pubic hair begins to darken and become more curly and coarse
- Pubic hair begins to spread to pons pubis and then laterally
- Breast begins to elevate above surface of chest
- Breast development beyond borders of aerola
Stage IV
- Adult-like pubic hair on mons pubis, but does not extend to upper thigh
- Increased breast size and elevation
- Areola develops a second elevated region that extends beyond the plane of the rest of the breast.
Stage V
- Adult pubic hair distribution and texture
- Breast is adult in size
- Areola's secondary elevated region begins to regress to the same plane as the rest of the breast
- Papilla remains projected