Answer:
Tanner stages in girls Age at the start Noticeable changes
Stage 1 :After the 8th birthday
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 rate
Stage 4 :Around age 13 First period arrive
It raises your metabolism
