Hi there I am an aunty to my darling neice who ...

Hi there I am an aunty to my darling neice who is 11 weeks old. I am currently looking after her indefinately. Previously she was diagnosed with mild reflux and put on S26 AR but for reasons unknown to me her doctor switched her to S26LF and then she came into my care while on this formula and was doing well , well so I thought she was having 3 loose bowel motions a day not a lot wouldnt even cover a teaspoon but her doctor again changed her formula to Infasoy and the poor child is in so much pain it reminds me of my own colic'y babies. But the thing is she is burping well and passing gas constantlly so I know its not because she is retaining wind. Any suggestions ?