Try not to feed your baby regular formula again after formula feeding allergy, you can breastfeed or choose a special type of formula for feeding. The symptoms of allergy after baby formula feeding may be due to allergy to cow’s milk proteins in the formula. Ordinary infant formula is based on cow’s milk, and its protein composition is different from human milk. Certain proteins enter the baby’s body as antigens and cause allergic reactions, which may lead to skin allergy and respiratory allergy in addition to digestive allergy symptoms. So the baby allergic to cow’s milk protein is best to choose breastfeeding, if you can not achieve breastfeeding, you can also choose hydrolyzed protein formula, amino acid milk powder and so on. Hydrolyzed proteins have lost the ability to cause allergies in the human body, which can reduce the baby’s allergy symptoms. For details, consult a dietitian or physician.