My DS is almost a month old. She is generally a very contented wee soul but during a few of her feeds she will gag, poo, wriggle and spit out the milk. We have tried different sized teats but to no avail. There doesn't seem to be any pattern to it either, sometimes she feeds well, taking 3 or 4oz other times its a battle to get her to have 2oz. Anyone else have this problem? Would love any suggestions, thank you!