i know it has a lot to do with body fat (i am not in any way saying your daughter is fat) although i know that once girls have a certain amount of percentage of fat their body knows they are able to carry a baby and thus their period starts. A large reason girls are starting so young is that so many youth are overweight lately. My ex boyfriend has a niece who is 5 and must be 80 lbs.. sadly for her, her period will start very early because her body thinks she is ready.. i feel so bad for the girl.. i HOPE your daughter isn't starting.. nothing worse than having more periods than you must

i think i started at 12 or 13... my mom made me feel really special.. we went out for a "girls" dinner.. and it was great. keep us posted.. hope everything is ok