When a baby has a fever of 39℃, parents should closely observe the baby’s mental state. If there is poor mental health, lethargy, etc., you should go to the pediatrician immediately to avoid causing high fever convulsions. If the baby’s mental state is good and there is no crying and other phenomena, physical cooling and medication can be used to try to lower the temperature first. During the treatment period, parents can let the baby eat in a small number of times to ensure sufficient energy intake. A, physical cooling 1, unpacking clothing: fever itself is an external factor causing disruption of the body temperature center, the phenomenon of increased heat production and reduced heat dissipation. At this time must help the baby heat, the most direct heat dissipation is to try to unpack clothing, appropriate through the environmental temperature to reduce the baby’s temperature; 2, warm water wipe: appropriate with warm water wipe the body, such as forehead, neck, armpits, groin and other parts of the blood vessels are rich. In the process of wiping the body, through the evaporation of water to reduce the body surface temperature; 3, drink more water: appropriate to drink more warm water, through the body sweating or urination to help reduce body temperature; 4, antipyretic paste: such as the local application of ice patches, the use of ice pillows or antipyretic paste, can also quickly cool down, but the duration is relatively short, after the treatment, the fever will soon appear again 39 ℃ situation. Second, medication in the case of physical cooling is not effective, you can give medication, such as acetaminophen for babies over 3 months old, and acetaminophen or ibuprofen for babies over 6 months old, the dose and type of medication is different for different age groups. Generally, after taking medication, the body temperature will gradually drop, and parents should pay more attention to observe the change of body temperature.