Zach just fell, and I'm guessing he hit his chin. He has two teeth marks on the inside of his lower lip. It bled a little, but not tons. He cried a lot more than he usually does when he gets hurt though, and that freaked me out a bit. He seems ok now- maybe 20 mins later. I gave him a couple of popsicles, and he nursed. Anything to be concerned about? Can't believe I've never dealt with a mouth injury until now!