Go get him this
(2013 COMbat B3: B3SL1 -12 Senior League)
My son is 7 and played travel baseball last year on an 8U team. They played mostly USSSA Major/Open. As long as it had the 1.15 USSSA stamp u were gtg. This bat is awesome because the -12 drop. My son is 49.5" and about 55lbs he swings the 27" 15oz.. He controls it very well and in 74 games this year he drove the ball to the 180' fence several times. I suspect this up coming year once he turns 8 he'll drive a few over the fence. He became even more confident once he put this bat in his hands. Also it's a 2 5/8" barrel so check into that as well. He hit the 2 1/4 well but if they let him use a bigger barrel he'll get even more confidence.