Breastfeeding may occur infant allergies, one is allergic to breast milk itself, the other is allergic to certain foods, as follows: 1, breastfeeding allergies, generally refers to protein allergy, that is, the baby is allergic to the components of breast milk, the occurrence of a lower chance. Because the proteins in breastmilk are homogeneous proteins for infants, allergy rarely occurs.2. If the mother consumes foods such as nuts, seafood, eggs, etc. during breastfeeding, and the infant happens to be allergic to these foods, the mother ingests these nutrients into her body, and secretes them to the infant through her breast milk, and the infant develops allergy, and may experience rashes, vomiting, diarrhea, etc. The infant is also allergic to certain foods, such as seafood, eggs, and other nutrients. Therefore, when such symptoms appear after an infant has eaten, parents should pay attention to the situation and clarify whether it is a case of allergy. If it is clear that the infant has an allergen after examination, the mother should stop consuming the food that causes allergy to the infant 2 weeks before feeding, and the infant may not develop allergy after breastfeeding again. Once an infant develops allergy after breastfeeding, the infant should go to the pediatrician for allergen screening to identify the cause of the allergy and make appropriate adjustments to the infant’s diet. If the allergy is more severe in a breastfed infant, special formula may be given for feeding, breastfeeding may be suspended, and contact with solid foods and milk may be avoided.