[Syncro]

Because of nutrition and other factors, girls are hitting puberty at an earlier age.

[Old Professer]

I think they are born pregnant.

[utahagen]

I've researched the issue of why girls are maturing at earlier ages and I believe that the reason is body weight. Estrogen is produced and stored in fat, so the heavier the little girl, the earlier hormone levels surge. Think back to high school: the naturally thin ectomorphs were late bloomers who started menstruating later than everyone else. Nowadays, children are so much fatter. The body fat explanation also accounts for the fact that black girls menstruate earlier than white girls (i.e., overall, black girls are fatter.)