Does anyone have a child that sings to him/herself softly while working? I have to find a way to help my child (1st grade) stop this behavior. It is a real problem at school. I think she does it when she is happy, she does it when she needs to focus, and she does it when she is anxious and wants to block things out.

This is not a new thing. It has gone on forever and has always been a problem, but she really has to stop.