Any good sites for children BMI?

I was wondering about my twin 7 year olds BMI's. One of them is overweight, slightly. He doesn't appear to be obese, he's very muscular and strong. He is 4'2" and weighs 72 pounds. When I calculate his BMI with a child's calculator it says that he is overweight. This is no suprise to me. However, his brother is 4'3" and weighs 70 pounds. He is very slim with no fat whatsoever!! When I put his stats in, it says he was at risk for being overweight. WHAT!!!!! That seems incredible. He really is slim and almost skinny. Is there a site that anyone knows about that will give me an accurate picture? BTW- there only appeared to be 3 categories of results--overweight, at risk of being overweight, and underweight. What happened to average or normal weight?? Thanks for your help!! Shelley

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