Food allergy is an abnormal reaction caused by proteins in food because your baby’s digestive and immune systems are not well developed. Once a baby is diagnosed with a milk protein allergy, milk and milk products should be avoided completely. If the baby is breastfed, the mother should strictly avoid milk and milk products. It depends on the relief of the allergy symptoms, if the relief is good, the child’s growth and development is not affected, the mother can continue breastfeeding, but the mother should pay attention to calcium supplementation. If the symptoms are not well relieved and growth and development are affected, it is best to use special hypoallergenic formula for early intervention. If the baby is mixed-feeding or formula-feeding, the mother needs to abstain from eating, and at the same time, the baby’s milk powder should be changed to special hypoallergenic formula milk powder. Because once diagnosed with allergy, it should be treated as soon as possible. If left alone for a long time, the child will grow up to become allergic to the respiratory tract, such as allergic rhinitis, asthma and so on. Therefore, for infants with milk allergy, in addition to strictly avoiding milk and milk products, they should choose a full nutritional formula that can replace the milk formula to meet the needs of growth and development. It is recommended to choose 100% free amino acid formula for alternative feeding, mainly used for babies with milk protein allergy or multiple food protein allergy.