At 13U we play 54/80. Because of his travel ball, he is not playing "middle school ball". I think that would be to much on the arm, as he would never get a day off, plus the "burn out" effect is something I have tried to always think about. When he does band work, it is only for stretching purposes, never "arm building". Only throwing 4 times in January, when you say it like that, I realize wow, I definately went wrong there.
We start with light drill work from 15' away, and gradually work our way back to 60'. By the time we are done throwing he has thrown 30 times in drill work, and 10-15 pitches from 60'. You try to tell them to slow down, gradually let the arm warm up, but you know how it is when a kid throws hard, they just want to go all out, hopefully this opens his eyes a bit. I am going to take him to a sports therapist Monday if he has pain again after throwing Sunday. This is the first time he has had pain, so I just want to be safe. Thank you so much for your thoughts, and I will keep you updated.