DS didn't put stuff in his mouth so much when he was a baby, but when he was older. A couple years ago he told me he found GUM!!! on the playground. Bleah! Not much I could do about it after the fact. Cringe! And I still get after him for putting his mouth on counters, display windows and grocery cart handles at stores. I always wipe down the carts with the wipes the store provides, but ewww!