Don't be a doctor at home unless you have figured out that the food that causes allergy in your child. You may want to go through the link to understand the problem better.
https://www.foodallergy.org/diagnosis-and-testing
http://kidshealth.org/en/parents/allergy-tests.html
http://kidshealth.org/en/parents/allergy-tests.html
http://www.webmd.com/allergies/guide/food-allergy-testing
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yes they do have. skin test or by blood test, ask your childs pedia