Whats te average weight for a 12 year old im 5 foot 1 and i weigh 7 and a half stone and my dad thinks im fat?

That is a healthy weight for someone your age and height. Don't listen to your dad - you aren't "fat" by any means. If you still feel concerned, talk to your doctor about this. Maybe even bring your dad along, so he'll see you're actually at a healthy weight.

i hav put on half a stone though am i still healthy?