For the past several weeks, my now 4 month old dd has been causing me terrible pain every time she eats. She'll latch on and start eating but after a few swallows, she clamps down even harder on my nipple and pulls her head back as far as she can without letting go and continues to try to eat. After a few seconds of this, she gets upset and lets go and we start the process over. She's a big baby and has been gaining weight and has been in the 95th percentile for weight and height since birth. Her weight gain has slowed down considerably since she started doing this. I'm in so much pain, I have to mentally prepare myself every time we nurse. I've tried everything I can think of. Her latch is perfect when she first starts nursing. I've tried different holds, different ways of supporting her head. I've tried taking her off and burping her and repositioning her every time she does it. I don't think she's having stomach troubles. She has shown some signs of teething, but I just really don't think that's what is causing the trouble. She's my third and I've never had any trouble at all so I'm completely at a loss now. Any suggestions would be GREATLY appreciated.