In the case of a baby with a fever of 42 degrees, the baby’s body temperature needs to be brought down to below 38.5 degrees as soon as possible. First, the baby needs to be stripped of the excessive clothes worn on the body and the collar of the blouse should be untied to promote heat dissipation in the body, while the windows should be opened for ventilation to allow air circulation. Secondly, the baby should be given acetaminophen suspension and other antipyretic drugs to cool down the baby. At the same time, the baby should be given a warm bath to achieve the auxiliary effect of physical cooling, so as not to lead to high fever and convulsions in the child. Under normal circumstances, the body temperature will gradually drop after half an hour, during this period parents should pay attention, feed the baby more water, every hour to measure the temperature once, if the child repeatedly high fever, it is necessary to send to the hospital for treatment.