There is no fastest way to treat heat rash in babies, the common treatment is to wash and wipe the body more often and apply glycerine lotion. The main reason for heat rash in infants is that they sweat a lot because of the high temperature, and the sweat cannot evaporate in time, causing the blockage of sweat ducts, which is most common in the neck, chest and back, and some heat rash will be accompanied by itching sensation, and after scratching, it may turn red. A common way to deal with heat rash is to wash and wipe the body with lukewarm water, which can rinse away the sweat on the skin surface, thus speeding up the evaporation of sweat to a certain extent and improving the symptoms of heat rash. You can also apply glycerite lotion on the baby’s body to astringent, anti-itch effect. It is recommended that babies with prickly heat be seen by a doctor and treated according to medical advice.