Final answer:
Foods that are common allergens should be introduced to an infant's diet around 4 to 6 months of age according to updated guidelines, under a pediatrician's advice. Care is necessary as reactions can range from mild to severe, and cow's milk in particular should not be given as a substitute for breast milk or infant formula. .
Step-by-step explanation:
Food allergies occur when the immune system misidentifies harmless substances in food as harmful, triggering an allergic reaction. Symptoms can vary from mild, such as itching and swelling, to severe, like trouble breathing or anaphylaxis. It's important for a child's first exposure to potential allergens to be monitored for signs of an allergic reaction, and parents should be prepared to seek immediate medical attention if severe symptoms occur.
Recent studies like McGann and colleagues' research in The Lancet show that additives in foods can also affect behavior, indicating the complexity of food-related reactions in children. Parents should also be aware of the possibility of developing Type I Hypersensitivities, which involves a rapid immune response upon re-exposure to an allergen after initial sensitization.