From a former little league coach.
1. Back elbow shoulder height. Kids tend to drop their elbow and as such cannot get around on the ball fast enough.
2. At this age, no one is throwing an effective curve ball. Have the player line up his front foot at the back of the plate. Kids tend to straddle the plate.
3. You can tell a scared batter by his swing. Instead of stepping into the ball, he will move his back leg further back. Swing will be weak at best.
4. Don’t swing at the ball. Swing through the ball.
5. You will love this one. Double Dutch. Teaches players to roll their wrists and gives them better footwork.
I don’t understand “double Dutch”