Currently, the thermometers commonly used to measure the temperature of infants are mercury thermometer, electronic thermometer, infrared forehead thermometer. 1. Mercury thermometer: mercury thermometer is a more commonly used medical thermometer, the measurement results are more accurate. However, babies may not cooperate well with it. 2. Electronic thermometer: electronic thermometer is more convenient to use, electronic thermometer by the temperature sensor, liquid crystal display, button battery, special integrated circuits and other electronic components, non-toxic and harmless to the human body and the surrounding environment, but the results will be biased, you can measure a few more times. 3. Infrared forehead thermometer: ear infrared thermometer, commonly known as the ear temperature gun, this thermometer only need to probe against the baby’s inner ear canal, and then gently press the temperature measurement button for a few moments, you can quickly get the body temperature data. The measurement of body temperature is accurate, in order to better go to the choice of clinical medication, the judgment of the condition is also very helpful.