Fever in infants may signal the development of disease problems such as respiratory infections, gastrointestinal infections, neurological infections, or non-pathological problems such as summer fever. 1. Respiratory infections: Children may have a fever accompanied by respiratory symptoms, including coughing, coughing up sputum and runny nose. 2. Digestive system infections: Fever is also a common symptom of digestive system infections, and is usually accompanied by abdominal pain, diarrhea, nausea and vomiting. 3. Nervous system infections: usually acute onset of high fever, projectile vomiting, persistent headache, followed by mental changes, accompanied by drowsiness or semi-comatose, coma and so on. 4. Summer fever: small infants are prone to summer fever in summer, which can be improved by lowering the indoor temperature and reducing clothing. There are other causes of fever in infants, such as autoimmune diseases, such as rheumatoid arthritis, etc. It is recommended to actively seek medical attention to find the cause and cooperate with the doctor if necessary.