A study published in this month’s issue of medical journal Pediatrics confirms what parents have been worriedly noting for some time: girls are going into puberty younger than ever before.
The study looked at 1,293 girls aged 6 to 9 in East Harlem, Cincinnati, and the Bay Area. Each group was made up of 30 percent each whites, blacks and Hispanics, and 5 percent Asians. Girls were measured to see if their breasts were beginning to develop, which the study theoretically considered the beginning of puberty. The results? At age 7, 10.4 percent of whites, 23.4 percent of blacks and 14.9 percent of Hispanic girls were developing breasts. At 8 years, the figures increased to 18.3 percent, 42.9 percent and 30.9 percent, respectively.
Lead researcher Frank Biro, who is director of adolescent medicine at the Cincinnati Children’s Hospital Medical Center, told the New York Times that his team blames the result on obesity (body fat produces estrogen that triggers breast growth), as well as on environmental triggers: “‘It’s certainly throwing up a warning flag,” Dr. Biro told the Times. “I think we need to think about the stuff we’re exposing our bodies to and the bodies of our kids. This is a wake-up call, and I think we need to pay attention to it.”
Biro also told the Times that his research team was now looking at the girls’ hormone levels and doing lab tests to measure their exposure to certain substances.



