Three-year-old baby temperature 37.3 ℃ (axillary or oral) belongs to low fever, caused by physiological reasons, such as after activity, or pathological reasons such as infection. Three-year-old baby armpit temperature measurement normal value is generally between 36.0 ℃ ~ 37.2 ℃, oral temperature is normal between 36.3 ℃ ~ 37.2 ℃, if the axillary or oral temperature of 37.3 ℃ belongs to the hypothermia of the body temperature. 1. Physiological factors: if the exercise or activity, just after eating, too much heat dissipation, the temperature will be slightly high, can be reduced to normal after rest. Generally, no special treatment is needed. 2. Pathological factors: mostly seen in infectious factors such as respiratory diseases, gastrointestinal infections, vaccination and other factors can cause an increase in body temperature. If your baby’s temperature rises, you should consult a doctor as soon as possible to determine the cause of the illness and follow the doctor’s instructions for treatment.