My 9 week old, normally a fantastic feeder, has just started screaming as soon as she gets near my nipple. I use nipple shields but she has been fine with these so I don't think it's that (I offered her food without one as well). She has the full arched back and red face (very unusual for her, she's a sunny baby).
The only thing I can think of is that I have changed from washable to disposable nursing pads. Could she dislike the smell/taste? I hope not since I am enjoying not being clad in yogurt 24/7.