J.L.
I had the same problem with my 15 month old daughter. The GI told us to stay on soy for a while, which she is still on. She can tolerate other diary just not the whole milk, which is odd cuz she always had the regular similac as a baby. I would try soy and after a few month you can slowly switch her back to whole and see what happens. We did that and my daughter got the rash again, so its back to soy, the GI rec. at least 3 mmonth on soy before trying whole milk again. Sometimes their digestive system isnt mature enough for whole milk at 1yr but that doesnt mean she wont be able to eventually be on regular milk.