Big Changes: Stages of Adolescent Development

(Adapted from Puberty Information for Parents and Kids, https://childdevelopmentinfo.com/ages-stages/teenager-adolescent-development-parenting/puberty/#.WPeL4YWcG1t)

Stage Boys Girls
1 No sexual development No sexual development
2
  • Testicles enlarge around age 9
  • Body odor begins
  • Breasts begin growing, may start as early as 8 years old
  • Body odor begins
  • Pubic hair starts to grow around age 9-10
  • Growth spurt begins between ages 9-14, average age 12
3
  • Penis begins growing
  • Pubic hair starts growing around age 12
  • Wet dreams (“nocturnal emissions”) begin
  • Breasts keep growing
  • Pubic hair darkens
  • Vaginal discharge begins
4
  • Voice deepens beginning around age 13
  • Penis and testicles continue to grow
  • Penis and scrotum deepen in color
  • Pubic hair becomes curlier and coarser
  • Growth spurt begins around age 14
  • Breast development begins
  • Menstruation begins usually 2 years after puberty starts – can be as early as 9 or as late as 15 – average age is 12.5
5
  • Penis reaches full size around age 16-17
  • Pubic hair extends to inner thighs around age 16
  • Height spurt tapers off
  • Fully mature male
  • Pubic hair extends to inner thighs around age 14
  • Height spurt tapers off
  • Breasts are fully developed between 12-18 years old
  • Fully mature female