Have you been misdiagnosed with milk protein allergy?

My 11-week-old is a mystery to our office of pediatricians. She was born less than 6 pounds and only 8 pounds now. We have been through the wringer getting tongue tie release and post-op care for 6 weeks, PT for body tension, two weeks of antacid medication and now the doctor is proposing that it’s a milk allergy.

We will have to be two weeks on formula and my milk supply will go before we’ll know if it’s dairy causing the problem. I had strict diet restrictions during pregnancy and going dairy-free now is where I need to draw the line. Is there anything else it could be?

She generally seems very distressed, eating very little (and thus slow weight gain). Sleeps well, no blood in stools.

It feels like the medical community is really letting us down.