Just get a lighter bow! I think my little cousin had a browning midas or someting and it was like 10 or 15 pounds. Won't kill a deer, but it will be fun and easy to shoot. If you want to buy someting that holds it back, you might as well buy a x-bow.

Small light youth bows like that are cheap. You dont need to spend a fortune on a top of the line youth bow that he will outgrow in a year. When hes old enough to hunt, buy him a better bow.