Mine was younger when he bit, and I would yelp - not deliberately as such, but I didn't try to hold back on expressing my discomfort either. I would also finish the feed then (by then he tended to be biting because he was starting to feel full and get bored anyway). If he was hungry later then we could try again, but if he bit, same thing, feed over. That worked for us, within a few days.

I'm sure others will be in with ideas re: what worked for them, I'm sure the same thing won't work for everyone. Good luck with it.