A wise older mom told me years ago what she did with her 3, and I did the same with both of mine so far, and it worked like a charm. When I got that first bite (at a few months old), I let loose a shrill, blood-curdling NNNOOOOOOOO!!!! at the top of my lungs. All 5 kids in this situation unlatched, startled, and 2 of them whimpered a little. Not one of them ever bit a nipple ever again.
L (40), wife to C (40), mom to dd C (19) freshman in college and world traveller, and ds K (16) ballet dancer and high school junior, and expecting #3 April 1st 2015. I'm a homeschool veteran (12 yrs) and full-time RN, my first two were natural hospital births and I breastfed both of them. Also, I won't tell you how much my kids weighed at birth, and I'll never ask anyone else, because I think it's TMI to know how much poundage someone passed through their wawaha.