What Is The Tanner Stage Of Development?
What Is The Tanner Stage Of Development? Tanner stages in girls Age at the start Noticeable changes Stage 1 After the 8th birthday None Stage 2 From age 9–11 Breast “buds” start to form; pubic hair starts to form Stage 3 After age 12 Acne first appears; armpit hair forms; height increases at its fastest