A one-year-old baby with a low fever of 37.7 ℃, if the axillary temperature or ear temperature, has exceeded the normal range, belongs to the low fever. In general, the body temperature of one-year-old babies is the same as that of older children and adults, and the daily temperature fluctuation is 36.2 ℃ ~ 37.2 ℃ by axillary and ear temperature measurement, and the temperature ≥ 37.3 ℃ belongs to fever, 37.3 ℃ ~ 38.0 ℃ is low fever, 38.1 ℃ ~ 39.0 ℃ is moderate fever, and ≥ 39.0 is high fever. Usually temperature is divided into oral temperature, anal temperature, axillary temperature, ear temperature, forehead temperature, different measurement methods, to determine whether the standard of fever is slightly different, while trying not to measure the temperature of the baby in the state of crying, easy to cause errors, the measurement tool to the glass thermometer is appropriate. Baby low fever, may be too high with the external environmental temperature, humidity is too large, there may also be infections and other inflammatory diseases, should closely observe the baby’s state, monitor the body temperature, if necessary, timely pediatric consultation, to clarify the cause of the disease, to take targeted treatment.