P.S.
Hi,
I'm a personal trainer/nutritionist. One of the things I would like to say is that when dealing with this issue, make sure you do not keep drawing attention to his weight. What is he eating? Are there a lot of refined sugars in his diet (sweets, soda, sugared cereals)? Is he active? How much time is he spending on the computer/gameboy?
There is an empidemic of overweight children in this country. Kids do not play outside like they used to. Video games have taken the place of tag and kick the can....
Many times there are programs at your local YMCA that will help your child become more active. What needs to happen is that he needs to burn more calories than he is consuming.
The other side of it is to find out if he's doing emotional eating. Did you take him to the doctor to see if his thyroid is working properly (usually not an issue but can be).
Hope this helps