Allergic reaction to foods. The latter category is more accurately defined as a food sensitivity rather than allergy. In either case, the best treatment is to avoid foods which cause problems.
Food allergies are common, food sensitivities even more so.
Food allergies in children often turn into simple intolerances as the children grow older. There are no proven ways to avoid food allergies. However, breastfed infants appear to have fewer food allergies later in life than their formula-fed counterparts. The best way to determine if a food is causing either an allergic or sensitivity reaction is via an elimination diet. This can be done simply by removing the suspected allergen from the diet, and watching the results.