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Why do some kids start puberty early?

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Some kids start puberty very early. If your testicles or pubic hair grow before age 9, you have what's called precocious puberty. (In girls, precocious puberty is when breasts grow before age 8.)

Obesity can cause early puberty. Sometimes a doctor can't tell why a boy starts puberty early.

If you're concerned about your changing body, writing things down in a journal can help. Your mom or dad will usually be able to tell when you've entered puberty or if you haven't. But tell your parents if anything troubles you or you think the changes aren't right.

From: Guys' FAQ About Puberty WebMD Medical Reference

SOURCES:

FamilyDoctor.Org: "Puberty: What to Expect When Your Child Goes Through Puberty."

HealthyChildren.org: "What's Happening to My Body?" "Physical Development of School Age Children."

Child Growth Foundation: "Puberty and Tanner Stages."

KidsHealth.org: "Causes of Precocious Puberty."

HealthyChildren.org: "Stages of Puberty."

Massachusetts General Hospital for Children: "Puberty."

Reviewed by Dan Brennan on October 16, 2019

SOURCES:

FamilyDoctor.Org: "Puberty: What to Expect When Your Child Goes Through Puberty."

HealthyChildren.org: "What's Happening to My Body?" "Physical Development of School Age Children."

Child Growth Foundation: "Puberty and Tanner Stages."

KidsHealth.org: "Causes of Precocious Puberty."

HealthyChildren.org: "Stages of Puberty."

Massachusetts General Hospital for Children: "Puberty."

Reviewed by Dan Brennan on October 16, 2019

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What else happens during puberty?

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