How can you improve the distance a 7 year old can swing?

My step-son is a great ball player. He just turned 7 this month and he has already been on all star teams and plays first base. We got him a good bat, and he has speed, but the ball doesn't seem to want to go over the fence which is really what he wants.

What tips do you have to make the ball go farther? Any exercises we can do?
 
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