Teething and biting during breastfeeding
My daughter had two spells of biting me while nursing. The first happened around eight months, and I swear, it seemed like it would never end. The second one happened around a year, and was just as long. In reality, they probably didn't last longer than a month apiece, and she stopped doing it after her teeth stopped bothering her.
I tried to teach her not to bite me, but it never really worked. She would still bite at the end of nursing or when she thought I should be paying attention (at least it felt that way). At times, it even made me angry--it hurt! But I swallowed my frustration and kept nursing. I'm glad I did, though, because once her teeth stopped bothering her, she stopped bothering me, and we continue to nurse with ease. :)