Overview Boys Girls PREPUBESCENT (STAGE 1) Basal growth; no penile or testicular enlargement; no pubic hair Basal growth; papillar elevation of the breasts; no pubic hair STAGE 2 Basal growth continues; minimal pubic hair; slight testicular enlargement (9-11years) First growth spurt; breast bud development (~8-13yrs) and areolar growth; labial pubic hair emergence STAGE 3 First growth spurt; emergence of pubic hair over pubis; continued testicular enlargement; penis lengthens; gynecomastia common Rapid growth rate; enlargement of breasts and areolae; pubic hair growth across mons pubis and axillae STAGE 4 Rapid growth rate (peak ~13.5yrs); pubic hair distribution spreads; continued penis (length and girth) and testicular enlargement; axillary hair growth; voice deepens Growth rate slows; secondary areolar mound formation; coarse pubic hair distribution spreads; menarche may begin (~12.5yrs) STAGE 5 Usually achieved maximum height; pubic hair distribution of adult; facial hair development begins Usually achieved maximum height; adult breast shape with minimization of areolar mounds; pubic hair distribution of adult References