What is the earliest age a child can be tested for food allergies?

It depends: Some food allergies can be obvious in the first few months, if a baby reacts to a certain type of formula or new baby food. If this occurs (with vomiting, rash, or diarrhea), notify your doctor. Others may take longer to develop and may require blood tests or skin tests at a later age to identify them specifically.

FOOD ALLERGY (FA) In: Infant ; children: most common-1st. 2 yrs, 90% from cows milk, egg, peanut, soy, wheat, shelfish, citrus fruit, strawberry, tomato. Cows milk in nursing mother's diet can cause allergic proctocolitis in infant. Most fa resolves in 3-5 yr except shellfish, pea/tree nuts till adulthood. Common test now: feia. Skin / rast test.

By 6 months of age!: Ige allergy antibodies do not cross the placenta so when present are the infant's not the mother's. But the presence of allergy antibodies on skin or in blood is not the same thing as a clinical allergic reaction. False positives are common - especially true when eczema is present. This is one area where an experienced board-certified allergist can be uniquely helpful. Be wary of igg allergy tests.