Hi beany, Amelia does this as well. I usually yelp in pain and surprise which startles her. I'm trying to do what Jen did with teaching her to kiss instead. It worked with hair pulling and face grabbing. She never means to hurt, and I don't think she really understands that she does. But we just stroked her face while saying "gentle, gentle" and she got it pretty quickly.

I do notice that the biting is always worse when she is teething, too.