13u. He's still only 11 (12 in Nov) but went from the small field to the big field in August playing in 14u. Best decision I ever made. He's a catcher so maybe it would have been different if he played somewhere else - certainly if he pitched. But as a receiver, I'm glad I walked him past 13u. Pitchers actually throw 90% over the plate instead of bouncing their pitches in the dirt 10' in front of the plate, they hold runners better so he has a chance to throw them out, and there appears to be less drama - more dugout fun and less 'can I play on this field' concerns. Curious about the experiences other catching families had on the big field jump.
I don't know. Around my parts, no 12u kid is going to be able to complete at 14u. Can he throw to 2B on a line, no rainbow? Otherwise, I'd be worried about some bad mechanical habits creeping in.