Can someone please help, not sure what to do. My 7 week old daughter was originally on Aptamil and we changed to Aptamil comfort milk due to colic and constipation, she was fine in that but then started to refuse and spit up after. So we then changed it C&G which she seemed perfectly fine in but since then has had runny poos. So we have now changed her back to Aptamil yesterday and every since she has been squeezing in pain and grunting.