M.C.
Babies explore by putting things in their months. Their tongue and the bottom of their feet are the most sensitive areas right now so that is what they want to feel with. He doesn't know that he can gag himself my touching around in his mouth. I think he is fine. Beware it sounds like he is going to put everything in his mouth. My son is 2.5 and my daughter is .5. My son wasn't like that, but my daughter will put everything in her mouth. Yesterday I caught her eating grass while we were outside playing. My son did chew on his fingers a great deal when he was teething. He started getting teeth at 4 months.