The causes of baby’s body temperature 35℃ at night are measurement error, low ambient temperature, hypoglycemia and disease factors. 1. Measurement error: Parents can touch the child’s body, if the limbs and trunk are still warm, usually the parents of the measurement method or location of the error, it is recommended to re-measurement. 2. Low ambient temperature: In the case of accurate measurement, if the temperature of the room is too low or the baby’s blanket is too thin, etc., it may make the baby’s body surface temperature too low. 3. Hypoglycemia:If the baby suffers from hypoglycemia or does not eat enough food before bedtime, etc., it may cause the baby’s blood sugar to be too low, which may lead to hypothermia. 4. Disease factors:If the baby is in fever and other acute illnesses, because after the fever, the baby will secrete a lot of sweat, resulting in the baby’s measured body temperature is too low. The baby’s body temperature of 35 ℃ at night, there may also be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.