Merck Manual

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Milestones in Sexual Development
PED_milestones_sexual_development
Milestones in Sexual Development

    During puberty, sexual development occurs in a set sequence. However, when the changes begin and how quickly they occur vary from person to person. For girls, puberty begins at age 8 1/2 to 10 years and lasts about 4 years. The chart shows a typical sequence and normal range of development for the milestones of sexual development.