I can't tell you how many pitchers at the 12U level were sidelined this year due to arm problems. It always amazes me how many coaches/players/parents get so consumed with winning rather than development. Our kids all pitch and all throw CH. We sprinkle in 3-5 cutters (different FB grip - we tell them it;s a cutter) per 60 pitch outings but nothing more.
How do you think a pitcher will ever have confidence in his FB or CH if he never has to throw it in a tight situation?