My DD has been going through the start of puberty since she was 7, she's now 9
We noticed lumpy breasts at 7, and took her to the Gp, who said it was her breasts starting to bud, but as a precaution he referred her to the local hospital to see an Endrincologist(sp), as she was going into puberty early.
Consultant at the hospital monitored her for just over a year, and then discharged her as once they pass 8 years old, they are happy for nature to take it's course and let the girls start puberty when their bodies say they should.
Dd's breast are slightly more noticable, but only still budding, she has daily baths, and wears deoderant, her hair gets very greasy very quickly and she has become slightly spotty. Also her body is filling out around her hips, tummy. She's very tall and slim, and you can see her 'rounding' out in a more 'womanly' way.
Emotionally she has regular patterns of very slight PMT, bless her and she takes evening primrose to help with that.
I've also had the 'talk' with her, and have explained in depth about puberty, periods etc.
Ive also given her a couple of wrapped panty liners to hide in her school bag, as she's now getting regular monthly bellyaches and headaches, to be honest I don't think it will be long before her periods start, and I don't want her worrying about having to go to the school medical room for sanitary wear.
As for the being 7st before starting your periods, I didn't reach 7st until I was 20 years old, and I started my periods at 10 1/2 years old, so personally I think thats a bit of a myth.
So sorry to waffle on, but I remember how worrying it was when I first noticed lumpiness in Dd's Breasts, and worried all weekend till I could get her to the Doc's on the Monday, so wanted to reassure you abit.