However, the most common symptoms overall are vomiting, diarrohea and abdominal cramping. Unfortunately these symptoms are common indicators of food intolerances, especially lactose intolerance. Some of the natural acids in fruits may cause a rash around the mouth, but is not an allergy, and diarrhoea may be caused by excess sugar in fruit juice, also a non-allergic response. If you suspect a food allergy, observe what your child eats and drinks and what reactions you observe. As you go about increasing the variety of foods in your baby's diet, do it with an eye out for those foods that are most apt to cause a problem.
Food allergens are usually proteins.
The protein in cow's milk, egg, peanut, fish, wheat, and soya are the most common food allergens, although any food may cause an allergic reaction. An allergy to a particular food may indicate an allergy to an entire food family, known as cross reactivity. Fortunately, most children do not suffer from cross-reactivity and are allergic to only one or two foods. If you discover that your child suffers from multiple food allergies, it would be wise to take the help of a pediatric dietitian who can help you create a diet that eliminates the offending foods without causing nutrient deficiencies while still offering variety. Once diagnosed, the only way to treat a food allergy is complete elimination of the food.