LO developed a milk allergy at 6 months and we've since switched to Nutramigen and so far, it's working! It's expensive (averages out to $12 a day!) a small cost for LO's well-being but we're crossing our fingers that once we get a prescription, it'll be covered by the health care system! We won't know until the end of the week though.
If your LO had a similar allergy, did your insurance cover formula?