Looks like I need to pick up a book on soon to be 4 year olds. I really don't know when to expect ds's next set of teeth. He'll be 4 in October. He has 20 so far. The last one's came in a long time ago. When do the big guys come in? I'm a dork for not knowing this, I know, so laugh if you must. I was brushing ds teeth and got curious.