...and counting

MLO has begun to count to three. He will even count his fingers, "One two three, one two three...." over and over. I can't get over that he knows the cue, "Can you count them?" and appropriately follows up with numbers. We started to play a game when he was 18 months old called, "5, 4, 3, 2, 1, no fingers, boom!" where I would show him my hand full of fingers, count down, and when we got to no fingers I would shout , "No fingers... Boom!" and give him a gentle punch. He loves it, and it's an easy way to entertain him in a restaurant while we wait for food. Ever since that became a favorite game, he got interested in counting the trees or houses in books. Of course, we clap and encourage his efforts, so he thinks this counting business is the bee's knees. I've lost touch with any books that indicate when certain milestones ought to be achieved, and we've been gone through his 18 month check-up, so I really have no idea what he's supposed to be doing developmentally. I don't worry too much about it, and it lets me think that he's the bee's knees for counting, so I think I'll go with it!