Eliminating single foods from the diet usually does not cause any dietary problems. For example, if you eliminate dairy products, your child will need to get calcium and vitamin D from other foods or supplements. Your child should try eating the food again in about 3 to 6 months. Never do this if a child has had a severe or anaphylactic reaction to a food. Such a child should avoid that food for the rest of his life.
Many food allergies are temporary.
If a child is less than 3 years old, he or she should try eating the food every 6 months until the age of 3. If the child continues to react to the food each time, get an evaluation by a board-certified allergist before you permanently eliminate the food from the diet. The risk is highest if both parents are allergic to foods. The onset of allergies in these children may be delayed if you are careful about their diet. If possible, they should breast-feed until they are at least 1 year old.