You are describing a form of repetitive behavior (sometimes called stereotypy) that is
commonCommon cold among children with
autismAutism
Autism - resources spectrum disorders. But, a number of studies have also pointed out that some repetitive behavior also occurs in typically developing a children and typical adults. Therefore, I don't think this behavior is necessarily cause for concern. From your description, it sounds like your son has typical social behavior and language, which are the remaining characteristics of autism. Having said that, your son might get some negative reactions from peers if he behaves this way in front of them. I think it would be useful to make him aware of this behavior in a gentle way and to suggest some alternative ways to relieve boredom and express excitement. The exact approach would depend on the age of your child.