I have a question regarding my 6 year old son. He is in the beginning stages of obesity. He is a very active child and he dosn't eat too much junk food. he is a couple of pounds heavier than my my year old. My 9 year old eats about the same amount of food and is just as active as my 6 year old, but he is as skinny as a rail. Obesity is in my jeans but not his fathers. Is this something that was just going to happen no matter what I do, or is there actually something I can do?