Arm crossing over

One of the kids on my sons team (12u) has developed a habit over the winter that has progressively become more pronounced. When he loads his arm to throw and reaches the equal/opposite position, his throwing elbow and the ball end up over rotating to the point the catcher can see the elbow and ball on the other side of the pitcher’s head. I know it can’t be good for his shoulder long term, but he is unaware of it and says he doesn’t feel shoulder discomfort. Any thoughts?

In general, there’s nothing wrong with “showing your number”. In fact, some pitchers need to in order to be squared up to the target at release. Unless you can truly trace some problem back to this, I wouldn’t worry about it.