My 3 y.o. was tested last year when she was 2 y.o. She tested positive for dairy, soy, eggs, peanuts, grass, cat, dog and dustmites
Fortunately, I am a registered dietitian who loves to cook otherwise I would have been so much more overwhelmed than I was. I have read ALOT about food allergies and have a great allergist.
If you have any questions, I'd be more than happy to help. My dh thinks I am an expert about all of this now