I always made sure my pitchers, my son included had proper rest between games. I would watch pitch count per inning as well as overall pitch count. Why would I keep a pitcher in that had thrown 40 pitches in 2 innings? When my son was 13 he was on a club team and a rec team. I had advised all the managers of the rec league prior to the draft that he would not be available to pitch except on a very limited basis and only if he had not pitched for the club team in the previous 48-72 hours depending on pitch count. There were other issues with the league the previous year plus my son would be playing high school ball instead of all stars. One day after I had advised the coach my son had pitched earlier in the day, the coach wanted my son to close. I told the coach no way. The coach was upset, but my son's arm came first, especially a young arm.