Generally speaking, there are two main causes of high eosinophilia in children: first, it is caused by the infant’s allergic constitution. If a child has allergies due to genetic factors or immune disorders, the eosinophils in the child’s blood are often high. In this case, the child should be given anti-allergic treatment, such as the application of glucocorticoids or antihistamines. Second, it is caused by parasitic infections. If an infant has a parasitic infection, such as a roundworm or pinworm infection, the eosinophil count in the child’s blood is also high. For parasitic infections in children, it is important to treat them promptly with medications such as intestinal wormer.