My 2nd was such a sensitive soul - the first time he bite me, I yelled "ouch!" really loud, and he went on a week-long nursing strike! Took a lot of coaxing to bring him back to the breast. But he had a lot going on that week, teething, my ex-Dh left us and an upset mommy.
But my 3rd, he wouldn't let go no matter how much I yelled - I would cram my finger in trying to get him to break the suction and he bite harder! So I learned to pull him in, basically suffocating him, so he had to let go to breathe. But then I would put him down, and refuse to nurse, and he eventually got over the biting, thank goodness!
Catherine from Frugal Baby Tips