does anyone know much about how much a 9 year old should weigh?

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MY 9 year old daughter was born weighing 6 pounds 1 ounce and put on weight really fast, she was very tubby until the age of about 3. she weighed nearly 3 stones then. a teacher commented on her weight today which has got me a little worried, she bacically asked me if my daughter had lost weight. since age 3 she has always been skinny, her baby weight dropped off her and there was no cut backs with her eating. in fact if anything my daughter probably eats too much lol. she isnt a fussy eater and will eat almost anything, loves fruits and most veggies, has far too many sweets and rubbish, like most kids i suppose. she finishes every meal i give her and sometimes even has seconds. she isnt a sickly girl just gets the usual cold every now and then, other then that she does not complain often of any tummy aches and her bowels seem normal. she is quite active i guess and always running around, and at school too. im not sure of her height but uk size 7-8 years clothes have recently become too short for her so she is now in soze 8-9 years though its very big for her around the waist. my other daughter is 5 in 2 weeks time and is the opposite, although she does not look too big now, she was 2 stone at the age of 1 but then started to slim down at the age of 2. she now weighs just under 3 and a half stone. her dad is 6 ft 4 so im guessign she will grow into her weight anyway. my 9 year old is just a few pounds heavier then her but 4 years older and possibly eats more and their activity levels are more enough the same, though the 5 yr old is a little more active id say. i have booked a doctors appointment for monday to get her height and weight checked out but i was just wondering whats everyones views on this and also id appreciate if you could tell me how much your nine year old daughter weighs, or did weigh at that age, my daughter just turned 9 last month. also does anyone know what the average weight is for 9 year old?could it be something like worms tht has stopped her putting on weight?