We switched ds to a level two nipple yesterday. He went from taking over twenty minutes to feed (leaving an ounce or two) to downing his bottle in less than ten minutes. (He is a slow gainer and has not doubled his birth weight yet so I am happy he is eating more.) If this too fast? He seems to be gulping and choking a little...will he get used to it, or should we switch back? Also, I am pumping (due to tongue tie and relux) and notice that he is struggling more with morning bottles when the milk is more watery...would it be okay to use a level one at this time and two the rest, or would this just confuse things?? Thanks for your replies!