Many babies often have many adverse reactions after drinking formula milk, just like crying, vomiting, diarrhea, etc., and in serious cases, skin redness and swelling, which can even affect their lives. So what are the general symptoms of formula allergy? First of all, baby allergy to milk powder is divided into rapid and delayed, rapid reaction often occurs 2 hours after the baby drinks the milk powder, and the symptoms can be serious enough to endanger the baby’s life. In the case of delayed-onset, the adverse reactions often appear only after a few hours or days, and the symptoms are relatively mild. In addition, babies allergic to milk powder can also cause gastrointestinal problems, such as diarrhea, abdominal pain and other symptoms, and in severe cases, bleeding during defecation, as well as redness and swelling of the skin, swelling around the lips and eyelids, difficulty in breathing, frequent coughing and runny nose. Also, babies who are allergic to formula milk may also be allergic to goat’s milk, meat, etc. Parents should pay close attention to this. Therefore, when a baby is allergic to formula milk, the first thing to do is to observe the baby’s symptoms and determine whether it is a quick-onset or late-onset condition, and then treat and feed the baby according to the doctor’s instructions.