Although breast milk is the best natural food for breastfed children, some babies have a special constitution and will have allergic reactions to the proteins in breast milk. The common symptoms of breast milk protein allergy mainly include: i. The symptoms of breast milk allergy are mainly gastrointestinal symptoms, the child may have abdominal pain, diarrhea, nausea, vomiting after eating breast milk, and in severe cases even cause blood stools, intestinal colic and other symptoms; ii. Some children allergic to breast milk protein will manifest as skin symptoms, the child has recurrent eczema; iii. jaundice symptoms aggravate, and some babies may even develop respiratory symptoms, asthma, cough, etc.