A child’s normal axillary temperature is 36°C to 37.2°C, anal temperature is 36°C to 37.5°C, and oral temperature is 36°C to 37.3°C. Therefore, it is not normal for a child to be 35.5°C. The normal body temperature of a child should be slightly higher than that of an adult, because the child’s body temperature center is still in the process of development, and metabolism will be faster. There are many reasons for a child’s low body temperature of 35.5℃, usually the following situations: 1. Cold environment: If the environment is very cold and the clothes worn are thin, it is possible to have a low body temperature of 35.5 ℃. 2. Use of antipyretic drugs: If after applying stronger antipyretic drugs, 35.5℃ hypothermia may also occur. 3. Pathological state: some diseases may also cause the child to have a low body temperature, such as thyroid dysfunction. If the child’s 35.5 ℃ hypothermia symptoms are not relieved, or accompanied by other symptoms, it is recommended to go to the hospital in a timely manner to consult a doctor to identify the cause of the disease, and then give targeted treatment with the help of doctors or treatment.