I'm sure this is going to make my toddler sound like a puppy, but sometimes when he is excited or wants my attention, he runs up and buries his face in the back of my legs....and then nips me! The first time he did it I am certain that I yelled out and then turned around and said "no biting!" It hurts. And is surprising! Now that he got that rise out of me, he does it all the time! When he starts burying his face in my legs, I turn around and pull him off and say "I won't let you do that. No biting" calmly. And then he laughs and runs away.

Any suggestions? He's 15m.