@boomerang,
I have a friend whose little girl is 7 and she has knots in her breast and started bleeding like a menstrual cycle. SEVEN. The Dr. advised her mom to steer clear of chicken that had hormones used and milk with hormones...only organic.
She is better - no longer bleeding... but she has little breasts already and has to wear little tanks with everything. Kind of sad. It doesn't phase her though...we are much more aware of it than she is I guess - for now anyway.
As far as boys are concerned...mine have been slow in growth from the get go.
I do think that the hormones and chemicals put into our food has a lot to do with some of the issues seen in early puberty.