After getting through dreadful early bfing problems (see post about reynauds) I'm now scared I'm not producing enough milk for ds2. I'm still using nipple shields and when he feeds now he thrashes around, pulls off constantly, cries a lot and I have to try him on both sides. Earlier today it was so bad that I ended up giving him some formula as well and he drank 3 oz despite bfing for 45 mins beforehand. He's feeding every 2 hours or so. Could it be something other than my supply? If it is my supply what can I do to increase it?