Physical cooling methods for infants after vaccination include drinking more water, warm water wiping or bathing, more ventilation, etc. However, if persistent high fever is present, timely medical attention is required. 1. Drinking more water can speed up the metabolism, and at the same time through the blood circulation to reduce body temperature, but also to promote the sweat discharge, can assist the body temperature down, but also replenish the loss of water due to sweating. 2. Warm water wipe or bath, you can use a towel soaked in wet, for the whole body wipe, water evaporation process can take away part of the heat of the body surface. Similarly, you can use warm water to take a bath, but you need to pay attention to avoid catching a cold, but also can effectively reduce body temperature. Can not use alcohol, to avoid causing alcohol poisoning. 3. More ventilation, not because of fever and close the doors and windows, need to pay attention to ventilation, appropriate room temperature is conducive to the decline in body temperature, but to avoid catching cold. 4. Seek medical attention in time, if the effect of physical cooling is poor, and there is a persistent high fever above 38.5 ℃, then you need to seek medical attention in time, under the guidance of the doctor for antipyretic treatment.