I just fed Xander strawberry yogurt for the first time today (he's had strawberries once before, but not yogurt) and he had an immediate allergic reaction (hives, itching, difficult breathing, etc). After 4+ hours in the ER, we're home and he seems to be doing fine.

Has anyone had to deal with something like this? Was your kid permanently allergic to whatever it was? Did you see an allergist and have the allergy confirmed? Can babies grow out of allergies?