How old is he?we have a 'calm down' box that we use with our son.its a shoebox with things inside it that help him return to calm-and he can take his anger out on objects,not people.objects include :squeeze ball,rubber snake that he can twist with his hands,pipe cleaners that he can twist up,snow globe that he can shake (plastic),notepad and pencil for drawing...anything that includes an interest can be put in the box and then the box can be brought out when needed.at home we also have a stand alone punchball that he can punch if he needs to.

When the twins started doing this it was to show they were unhappy or frustrated and had no other way to tell us couple suggestions you can teach him the sign for mad or grumpy. Show him how to use pecs or a picture of mad or unhappy. Maybe use a stress ball or a chewy. One or more of these may or may not work depending on your child. Hope these suggestions help