I have the same problem with Dezi. She bites all the time and she is about to be four months so her teeth are really sharp and it HURTS! I keep saying no, she stops and looks at me and starts again. I turn around and Ignore, she then bites my toes. I put toys in her mouth and she bites the toy and my finger. I hope this stage goes by quickly. My hands look like I had a fight with a cat. LOL