Four-month-old babies with low-grade fever can be helped by increasing or decreasing clothing, warm water baths, monitoring body temperature and seeking prompt medical attention. 1. Increase or decrease clothing: this month’s baby low fever may wear too many clothes or quilt cover too thick, appropriate reduction of clothing and quilt heat dissipation after the body temperature may drop. Low fever sweating more timely replacement of soaked clothing, wipe sweat in a timely manner. 2. Warm water bath: use a warm towel to wipe the whole body skin, especially the armpits, groin, neck and these positions, wipe time should be longer. 3. Monitor body temperature and seek medical attention in a timely manner: closely monitor changes in body temperature, elevated body temperature or poor mental health and other symptoms, the need to seek medical attention in a timely manner. The baby’s age is small, the disease progresses quickly, need to pay attention to. 4 months baby persistent low fever, serious to go to the hospital for timely medical attention and treatment.