How much practice is too much for youth baseball players? The answer depends on several factors, including the player's age and his or her level of play. Be mindful of regulation pitch counts, as well as other time constraints such as breaks in between activities, snacks, etc.
For every young baseball player on any given recreational team, there are specific guidelines to follow based upon the player's age and circumstances. For example, for an 11-year-old player participating in a league that must adhere to AA youth rules, the program needs to abide by the 90-pitch (including warm-up pitches) maximum rule during any single game.
Pitch counts - this is a major concern for youth baseball players and parents. Monitoring throw time and pitch counts as well as making sure your young baseball player gets the rest they deserve at appropriate times in their long-term schedule are all to be taken into account when it comes to how much practice is right for any given player. (Coaching Youth Baseball)