My 8 month daughter is a having a similar problem. She does not want to nurse for more that 3 or 4 minutes. She is not gaining enough weight and has slipped down into the 5th percentile. I have tried every bottle known to man and she refuses. I am very worried about it. I can not wait until she is a year and I can give her cow's milk ( if she will take it). Hopefully then she will be able to gain some weight.