Assuming yeast, etc. has been ruled out, I have had some success having the mother nurse "upside-down." Well, not totally. Mom is semi-reclining and the baby is face down at about a 45 degree (less or more) angle and thereby grasping the aerola at 180 degree opposite where usual grasped when "right- side-up". It especially works well for an older baby. I believe Jack's babies were 7 months old. Might be worth a try. (Can be a problem if baby spits up a lot!!!!) Linda Pincus, RN, IBCLC