DS bit my nipple hard last night when I was nursing, and again this morning. I pulled him off and said "no" sternly but he just frantically lunged back at me. Poor baby is hurting from teething I think and is gnawing on everything...but man it hurt! I'm going to try Mrs. Pen's cheek flicking when it happens again...

Does your LO bite you? How are you able to dissuade it and how old was your LO when negative reinforcement worked? (DS is 4.5 months).