How many children are affected by/at risk of precocious puberty?

Precocious puberty is rare, meaning it affects about 1% or less of the U.S. population.¹ Many more girls are affected than boys.

One study suggests that African American girls have some early breast development or some early pubic hair more often than white girls or Hispanic girls. There is a greater chance of being affected by precocious puberty² if a child is female and African American and has obesity.