As we all know, breast milk is the best food for babies, but for various reasons, breastfeeding is not possible, so they are fed with infant formula, but some babies will have formula allergy, and parents need to pay attention to some symptoms of formula allergy. Milk powder allergy is also known as milk protein allergy. Certain proteins in milk such as alpha-s1 casein and beta-lactoglobulin are currently recognized as allergens. Under normal circumstances, if the body can digest and absorb these two proteins, they will not cause an allergic reaction. However, for babies just a few months old, these proteins can induce allergic reactions. There are three main symptoms of allergy to formula in babies. The first is digestive symptoms, where the baby has repeated vomiting, diarrhea, bloating, constipation, and blood in the stool. The second is skin symptoms, the baby will appear eczema, acute hives. The third is the respiratory symptoms, the child has frequent unexplained coughing and sneezing, and severe asthma. Because of milk powder allergy babies are irritable, often cry, sleep disturbance, affect the development, appear anemia, etc.. Vomiting after eating milk may also lead to aspiration pneumonia, which may require injections and medication. If you find that your baby has the above three symptoms after feeding milk powder, you can basically be sure that your baby is allergic to milk powder, so you should promptly change your baby’s milk powder to anti-allergic milk powder and switch to amino acid milk powder or deeply hydrolyzed milk powder depending on the severity of the allergy. Of course, each baby’s performance may not be exactly the same, so you can ask a professional pediatrician to determine the treatment plan.