A baby with a fever of 39.7°C will not generally burn the brain. Only when the body temperature is above 42°C will the proteins in the child’s brain cells be denatured by the high temperature, so that the brain will be burned. A fever of 39.7°C will not burn the brain, but it is likely to induce febrile convulsions. Especially for infants and children under 5 years old, high temperature stimulation can easily produce febrile convulsions and damage the child’s brain function, so it is best to quickly carry out fever reduction treatment, such as oral ibuprofen suspension or acetaminophen suspension to reduce fever. Generally, the medication can be repeated after an interval of 4-6 hours, no more than 4 times a day, and the specific dosage should be used according to the baby’s weight and in accordance with the instructions. In addition, a fever of 39.7°C can damage the brain if there is viral meningitis, tuberculous meningitis or bacterial meningitis.