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What causes puberty in girl?

ANSWER

The female hormone estrogen is the main trigger for all the changes in a girl's body.

From: Girls and Puberty WebMD Medical Reference

SOURCES: 

American Social Health Association's Iwannaknow.org: "Puberty for Girls - What to Expect." 

American Academy of Pediatrics: "Puberty Information for Girls."

Reviewed by Amita Shroff on April 23, 2018

SOURCES: 

American Social Health Association's Iwannaknow.org: "Puberty for Girls - What to Expect." 

American Academy of Pediatrics: "Puberty Information for Girls."

Reviewed by Amita Shroff on April 23, 2018

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What are the first two signs of puberty in girls?

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