Hi, 3 of my six kids had GR Disease, so I know how hard it can be. My last baby was the worst of them. We were breastfeeding to start, but the breastmilk was to light so she would throw it up right away, she just could not keep it down. So we, by the recommendation of the doc,changed to Enfamil AR too. She will need a week or 2 to adjust to the new formula. But to help her, give her juice, watered down, you can also give her corn syrup added right to her bottle of formula, and the last thing I can think of is to feed her prunes if is she is eating fruits already.
I just wanted to let you also know that the formula (Enfamil AR) really did help, espically after a week or so, we were able to take her off the meds, after 2 months and took her off the formula, back to a normal formula in 4.
HTH,
J.