Thanks for all the suggestions - we have had a string of ear infections, but we've fixed them and that does not seem to be the reason unless that was the problem initially and it convinced him to quit nursing that side, tried changing position and still squirms like I'm giving him a bottle (which he also will not take), can't switch during feeding either - just decides he'd rather have neither at that point. Oh well, I just try to give him that first at night to keep supply available. They all have their own little quirks I guess.