Here are a couple ideas for youth baseball coaching tips for reinforcing pitching skills.
Pitching in slow motion – Since the delivery is important, one of the ways to get your baseball pitcher to find a consistent wind up and delivery is to have them exaggerate each step of their entire pitching motion. This creates muscle memory, and will help their body and mind work together to build a solid, consistent, motion for pitching.
Strike zone pitching – You can easily create an apparatus that simulates the average strike zone for a little league player, and you can use that to help a pitcher build control, and to learn their proper release point for an increased number of strikes. Once a player starts to gain control, you can decrease the size of that area as the pitcher begins to pick specific target areas.