Although the probability of an infant being allergic to breast milk is very low, some infants are still allergic to breast milk. If an infant belongs to a severe allergic body, he or she will develop allergic symptoms to various proteins. Since breast milk is rich in proteins, some infants are still allergic to breast milk, resulting in a series of allergic symptoms such as eczema, allergic rhinitis and chronic diarrhea. If an infant’s allergy to breastmilk is mild and does not affect normal growth and development, he or she can continue to breastfeed. If the infant’s allergy to breastmilk is severe, the infant should be fed with deeply hydrolyzed protein formula or amino acid milk powder in a timely manner.