So my son has been kind of a pain lately, extra fussy, and refusing to eat to sleep. I had a hunch he has his first teeth coming in. I checked his mouth and sure enough I felt 2 teeth starting to break through on the bottom. But ever since that first feel he refuses to let me check again. He shuts his mouth or will cover it with his tongue. He doesn't want me to touch him at all (I even got a teether thrown perfectly at my head...thanks kid). Is this normal?