Baby fever headache may be caused by acute tonsillitis, pediatric bronchopneumonia, encephalitis and other diseases. 1. Acute tonsillitis: because the tonsils are the body’s first line of defense against immunity, the baby’s immune system is still developing, if a large number of bacterial or viral aggression triggered inflammation of the tonsils, resulting in baby fever and headache. 2. Pediatric bronchopneumonia: the respiratory tract is connected to the outside world, the baby’s respiratory system is not yet fully developed, susceptible to pathogenic infections, resulting in inflammatory reaction of the lungs, fever and headache and accompanied by coughing, shortness of breath and other symptoms. 3. Encephalitis: the baby’s immunity is relatively low, if the virus, bacterial infection of the brain parenchyma caused by inflammatory lesions may appear fever and headache with nausea, vomiting and other symptoms. Baby fever and headache, there may be other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.