Baby fever is recommended to use warm water to baby bath to reduce fever, with cold water rub for fever instead of good. Cold water rubbing will stimulate the baby’s skin blood vessels to produce contraction, but not conducive to heat dissipation, aggravating the fever. In addition, the use of cold water will also make the child feel less comfortable. Using warm water to rub the skin surface blood vessels to produce diastole, blood circulation is richer, conducive to heat dissipation, but also make the child feel more comfortable. In the armpits, groin, neck, palms, feet and other places rich in blood vessels, warm water baths can be slightly longer, which is good for reducing fever, and the effect is better. In addition, if the temperature of fever is higher than 38.5℃, warm water baths cannot lower the body temperature and oral antipyretic treatment, such as ibuprofen suspension or acetaminophen granules, is needed.