Pubic hair in boys and girls

P1

No hair

P2

A few long hairs on the pubis (down)

P3

Pubic hair above the symphysis

P4

Plenty pubic hair

P5

Extension of hair towards the roots of the thighs, and towards the navel in boys

Breast development in girls

S1

Lack of breast development

S2

Small breast bud with enlargement of the areola

S3

The mammary gland protrudes above the surface of the areola

S4

Appearance of a sub-mammary fold, protrusion of the areola and nipple

S5

Adult appearance, disappearance of the areola protrusion

Development of the external genitalia in boys

G1

Infant-sized testicle and penis

G2

Increase in testicular volume by 4-6 ml

G3

Increase in the penis and testicular volume of 6 – 12 ml

G4

Increase in the penis and testicular volume from 12 to 16 ml

G5

Adult morphologies