A 5-month-old baby with 38 degrees is considered to have a low-grade fever. The normal body temperature of human body is between 36 degrees and 37.5 degrees, 37.5 degrees and 38 degrees is low fever, more than 38.5 degrees is high fever. So the 5-month-old baby 38 degrees belongs to the category of low fever. Babies with low fever can take medicines to reduce low fever, Chinese patent medicines are Pu Di Lan, Shuang Huang Lian or Blue Scutellaria Oral Liquid. Western medicine pediatric aminophenol xuanamin granules also have the effect of reducing low fever. At the same time, physical cooling should be given, and more warm water should be drunk to promote the excretion of toxins. If the temperature rises further, go to the hospital to check the blood routine, in order to clarify the cause of the disease and treat the symptoms.