Suggest Remedy For Abnormal Behavior In 6 Year Old Child

HI. MY SON TOUCHES THE FRONT OF HIS TROUSERS AT SCHOOL AND HE MAKES NOISE DURING CLASS SOMETIMES. HE IS ONLY SIX YEARS OLD AND i DO NOT KNOW HOW TO DEAL WITH THIS. TRIED TO TELL HIM HE DOESN T HAVE TO DO THIS IN THE CLASS SO THAT THE KIDS WON T TREAT HIM BAD (CALL HIM NAMES) AT A POINT. HE SAYS THAT CANNOT CONTROLL IT SOMETIMES- AND I SUGGESTED THAT WHEN HE HAS THIS URGE TO GO AND RINSE HIS FACE WITH COLD WATTER. WHAT ELSE CAN I DO? I UNDERSTAND THIS IS NORMAL WITH BOYS BUT ISN T THIS TOO EARLY???