Lifespan's A - Z Health Information Library

Puberty is the period in life when the body changes rapidly and develops reproductive capability. Precocious puberty is premature development of body characteristics that normally occur during puberty.  Puberty normally occurs between 13 and 15 years old in boys, and between 9 and 16 years old in girls.

In girls, precocious puberty is when any of the following develop before 8 years of age:

• Breasts
• Armpit or pubic hair
• Mature external genitalia
• First menstruation

Some evidence suggests that it may be normal if these changes occur as early as 7 years in Caucasian girls and 6 years in African American girls.

In boys, precocious puberty is when any of the following develop before 9 years of age:

• Enlarged testes and penis
• Armpit or pubic hair
• Facial hair, usually first noted on the upper lip

The main causes are structural abnormalities in the brain and hormone-secreting tumors.

Blood hormone levels, computerized brain scans, and abdominal scans are often used to diagnose the problem.

Medications can temporarily suppress sexual hormone secretion. Some tumors require surgical removal.

Children (of both sexes) with early sexual development are more likely to have psycho-social problems. Children and adolescents generally want to be the same as their peers, and early sexual development can make them appear "different". This can result in self-esteem problems, depression, acting out at school and home, and alcohol and illegal substance abuse.

See your health care provider if:

• Your child shows signs of precocious puberty
• Any child with early sexual development appears to be having social problems in school