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Hypothermia for humans is body temperature below 95 degrees Fahrenheit / 35 degrees Celsius. Your answer depends on many factors: what type of temperature-measuring device you used (e.g., oral, anal, or ear insertion thermometer vs. temporal artery forehead contact thermometer vs. often-inaccurate forehead temperature strip), where it was inserted or applied, and if the device requires any type of result adjustment based on where it is inserted/applied (e.g., some thermometer instruction manuals advise addition of 0.5 to 1 degree if inserted in the underarm area instead of anal insertion); if your child was exposed to cold and if his body was allowed to rewarm after such exposure before taking the temperature; if your child was perspiring or had contact with water (e.g., bathing) and if his skin was allowed to dry completely before taking the temperature (i.e., in particular, may affect surface contact thermometers). With dry skin and some time in a room-temperature environment, if you find a corrected (per thermometer instruction manual) temperature reading less than 95 degrees Fahrenheit / 35 degrees Celsius, then his body is colder than it should be and you may want to call his doctor or consider an ER visit to determine the cause.