My husband used to do this as well and it is a form of self soothing, kind of like sucking on a pacifier, rubbing a blanket, rubbing your ear etc. Unless he is harming himself I wouldn’t worry too much about it. A friend of mine’s kid did this at her daycare and the provider told her that her son had autism and to get diagnosed. That was not true. It made her very distraught. I told her it is not a sign of autism and he is 13 now with no issues!

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