I have a 5 year old boy who is now in kindergarten. As far as academically, he is one of the top performer in his class. He is doing quite well in maths, reading and writing as well as following rules. However, he has a little problem playing with others and easily upset if others does not play his way. He is very emotional and he will cry even reading or watch sad stories. What really bothers me is his humming. He can't stop humming. He hums at bath time, eating time, and most annoying while we are driving. He does not hum random noise. He actually hum real songs that he learned from school and from his church music CD's. Now Christmas is around the corner. He is now humming some Christmas songs. I have to constantly remind him not to hum. Last night I ask him before going to bed, "How do you feel when you hum?". His answer was "Happy".

What should I do as a parent?