The average age of the onset of puberty has been dropping in the last century—with some girls starting to develop breasts as early as age six or seven. These shifts in the reproductive development ...

Add Yahoo as a preferred source to see more of our stories on Google. The most significant breast changes are the result of hormone fluctuations, say experts. (Photo illustration: Ivana Cruz for Yahoo ...

More girls are hitting puberty at eight or earlier. Researchers are exploring the causes, the consequences and what should be done. When Lola was eight years old, she went through a massive growth ...

Recreational physical activity may be associated with breast tissue composition and biomarkers of stress in adolescent girls, according to a new study from Columbia University Mailman School of Public ...

It’s long been known that women who are more physically active in their spare time have a lower risk of breast cancer, with those who are the most active having about 20 percent less risk of ...