Many of the serious injuries that occur in adult pitchers are now starting
to show up at the youth level.  The USA Baseball Medical & Safety Advisory
Committee has made several recommendations to reduce the risk of injury.
 

1.  Pitchers should not throw breaking pitches until their bones have matured
   (indicated by puberty) - typically about 13 years of age.  Focus should
   be on good mechanics, a good fastball and change-up and good control
    
2. Pitchers should develop proper mechanics as early as possible and include
   more year around physical conditioning.  Instruction from a qualified
   professional coach on the correct mechanic would be valuable.
    
3. Pitchers should be discouraged from returning to the mound in a game once
   they have been removed.
    
4. Players, especially pitchers, should be discouraged  from participating
   in showcase games due to risk of injury or at least given proper time to
   prepare or rest.
    
5. Pitchers are discouraged from playing for more than 1 team in a season
    
6. Pitchers should compete in baseball no more than 9 months a year and
   should avoid other overhead throwing activities or sports
    
7. They should be removed immediately from a game or practice if they
   complain or show signs of arm pain.
    
8. Pitch counts should be monitored and regulated.  Below is the recommended
   limits for youth pitchers.
    

 9-10 y/o     50 pitches/game  75 pitches/wk    1000/season  2000/yr
11-12 y/o   75 pitches/game  100 pitches/wk  1000/season   3000/yr
13-14 y/o   75 pitches/game  125 pitches/wk  1000/season  3000/yr

Pitch counts pertain to pitches thrown in games only.