Precocious puberty is when puberty starts earlier than normal—before age 8 in girls and before age 9 in boys—and it always deserves a medical check‑up. With prompt evaluation, most children can be treated effectively and supported emotionally.kidshealth+3

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What “normal” vs “precocious” puberty looks like

• Typical timing: Puberty usually starts between ages 8–13 in girls and 9–14 in boys.medlineplus+1

• Precocious puberty: Signs before age 8 in girls or before age 9 in boys are considered early and should be discussed with a doctor.kidshealth+4

• It’s more common in girls: Early puberty happens more often in girls than in boys and is rare overall (less than 1% of children).uclahealth+1

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Early signs in girls

Parents should watch for these signs occurring before age 8:kidshealth+3

• Breast development.

• Menstruation (first period) before about age 10.kidshealth+2

• Rapid height growth or “growth spurt,” new curves in body shape.kidshealth+2

Other possible signs include:kidshealth+3

• Pubic or underarm hair.

• Body odor, acne, mood changes (more irritability or emotional swings).

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Early signs in boys

In boys, signs before age 9 should be checked:kidshealth+4

• Enlargement of testicles and penis.kidshealth+2

• Rapid height growth and more muscular build.kidshealth+2

• Voice deepening, pubic/underarm facial hair, body odor, acne.kidshealth+3

Some boys may also have mood changes, such as increased aggression or risk‑taking behaviors.