Did the same thing as a tyke, according to my parents... Though I'm not sure I'm the example you want to use...
While Lebell is absolutely right that those actions could be signs of autism and should be treated accordingly, I believe that it's hardly anything to worry overmuch about. Between my own personal experience and the above posts, it sounds like something rather normal even if it does seem strange.
I don't suppose your kid'd be interested in monkhood?
Pie Jesu