Baby fever 39.5 ℃ can be seen in intracranial infections, influenza, diarrhea disease and other conditions, there is no “brain burn” problem, but in some diseases such as intracranial infections can be brain damage, need to be analyzed on a case-by-case basis. 1. Intracranial infections: such as severe bacterial meningitis, viral encephalitis, the baby can appear the above phenomenon, was repeated high fever, the effect of reasonable antipyretic is not good, can be accompanied by convulsions, poor mental health and other phenomena, improve the lumbar puncture examination can assist in the diagnosis. For this kind of children’s serious condition can appear brain damage, some children can leave serious neurological sequelae, such as intellectual regression, recurrent convulsions and other phenomena. 2. Influenza: often caused by influenza virus infection, clinical high fever, such as 39.5 ℃, often accompanied by muscle pain, generalized fatigue and other systemic symptoms, such children with mild illnesses generally have a better prognosis after reasonable treatment. 3. Acute diarrheal diseases: such as rotavirus enteritis, the above phenomenon can occur, often accompanied by diarrhea or vomiting symptoms, the general prognosis is better after reasonable treatment. 4. Other diseases: such as Kawasaki disease, clinical recurrence of fever, body temperature may show high fever, may be accompanied by skin rashes, conjunctival congestion and other symptoms, such children may appear cardiac coronary artery vasodilatation, and need to actively seek medical attention. It is recommended to actively consult a specialist to assess the severity of the disease and provide reasonable treatment.