Level 1: Symptoms of baby\’s allergy to milk powder Allergy refers to the body\’s adverse reaction to certain substances, while baby\’s allergy to milk powder refers to the baby\’s adverse reaction to certain ingredients in milk powder. Common symptoms include red and swollen skin, shortness of breath, diarrhea, vomiting, etc. After these symptoms, parents should take their baby to the hospital promptly so that the allergen can be determined promptly and treated accordingly. Level 2: How to prevent babies from allergic reactions to milk powder. Prevention is more important than treatment. In order to avoid babies allergic to milk powder, parents can start from the following aspects: 1. Choose the milk powder brand and milk powder suitable for their children.