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Girls' Secondary Sex Characteristics

Girls' Secondary Sex Characteristics Usual Age Range
The breasts begin to develop 7 to 13
Pubic hair begins to grow 8 to 14
The vagina grows longer, and its outer lips (labia) become more pronounced 8 to 15
The body grows taller and heavier 9 to 14
Menstruation begins 9 to 16
Hair begins to grow under the arms 11 to 16
Glands in the skin and scalp begin to produce more oil, which can cause skin blemishes 11 to 16
Last Updated
Caring for Your Teenager (Copyright © 2003 American Academy of Pediatrics)
The information contained on this Web site should not be used as a substitute for the medical care and advice of your pediatrician. There may be variations in treatment that your pediatrician may recommend based on individual facts and circumstances.
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