It has been in the news recently that girls are now reaching puberty earlier than compared with studies done long ago. Typically, the first signs of puberty are breast bud development. A new study that was recently published showed that more girls are entering puberty at age 7 and 8 than previously. Caucasian girls showed the largest increase but in total numbers, more Hispanic and African American girls start puberty earlier. The study is done by Dr. Frank Biro at the University of Cincinnati. For the study, Biro and colleagues examined data on 1,239 girls between the ages of 6 and 8 from East Harlem in New York; the greater Cincinnati metropolitan area; and the San Francisco Bay area in California.
The results also showed that:
- 10.4% of white, 23.4% of black non-Hispanic, and 14.9% of Hispanic girls had reached breast stage 2 or higher at age 7.
- At age 8, these figures were: 18.3%, 42.9%, and 30.9%, respectively.
- The proportion of girls who had reached breast stage 2 also varied by site and BMI (body mass index), with more obese girls reaching puberty earlier.
Biro and colleagues warned that their study was not representative of all girls in the US, and they will continue to follow this population to see what happens with the girls and what other factors might affect their development.
The first question that most parents are going to have is what is going on and the next being what can we do about this? The short answer is that nobody knows for sure. The theories range from genetics and obesity to environmental triggers. It would be very easy to jump to conclusions and blame hormones in milk or food but we really just do not know. We certainly can say that as a society our children are getting more and more overweight.
The problem with entering puberty earlier is that it puts that child at a higher risk for breast cancer later in life and they are more likely to engage in risky behavior.




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