Interesting study that links high income (over $50K, which doesn’t sound all that high to me, but what do I know!), lack of a bio daddy, and early puberty. Ethnicity seems to play a role and there is a link to increased likelihood of teen pregnancy.
They are thinking that it is the access to high calorie foods, exposure to artificial light via computer/TV, exposure to beauty products and chemicals that are tweaking their bodies.
The interesting thing is that they really don’t understand why this happening to these girls. They’ve been tracking them for 5 years and will track them for 5 more years.
Read more here – High Income, Absent Father May Lead to Early Puberty