Why is the temperature measured by the temporal artery thermometer higher than those by other thermometers?

It is well known that temperature varies in different parts of the body. Therefore, the standard of fever that we have become accustomed to, such as armpit temperature, cannot be applied to body temperature measured elsewhere. The temperature difference recognized by the international nursing community is that the core temperature of human body is 0.4℃ higher than the oral temperature on average, and 0.8℃ higher than the axillary temperature on average, and is about the same as the rectal temperature (difference about 0.1℃). Because the temperature measured by the temporal artery thermometer is the core temperature of the human body, therefore, core body temperature protocol should be used.

For newborns, the temperature measured anywhere should be the same, because the temperature regulation mechanism of newborns is immature.