The top secret drill . While the child is standing sideways to there parent have them Point front elbow toward there parent(elbow closest to there parent). Than have them push off with there rear foot to give them momentum to step over there front foot so there belly button is facing toward there parent. Do this without a ball.
After the child has this move down insert ball in rear hand, so them the L position and have them throw down and follow through with there hand going down an imaginary line. Or use the first or third base line.
I know I left out a lot but this is as basic as it gets for 5 year old
Oh since this is free advice take it for what its worth. The last thing I want is for a future Ted Williams to have a throwing fault because of me.
Yogi Berra was asked by a reporter "How do you catch a knuckle ball?" He came right back and said "When it stops rolling"