A child’s body temperature of 35.5 degrees Celsius is generally not dangerous if there are no symptoms such as infection, lethargy or abnormal mental status. The normal body temperature of a child is around 36~37 degrees Celsius, but there are individual differences, some babies have a low basal body temperature, or it may be caused by the low temperature of the environment and the child’s poor resistance, etc. In addition, the development of the child’s body temperature regulation center is still incomplete and cannot regulate the temperature well. In addition, the child’s thermoregulatory center is not fully developed, can not well regulate body temperature, body temperature of 35.5 degrees Celsius, but the general situation is good when you can pay attention to warmth, elevate the body temperature. If the body temperature is low for a long time, you should go to the hospital for a comprehensive examination, to exclude the low body temperature caused by diseases, and you need to increase the daily exercise to enhance the body’s immunity, and appropriate supplementation, to promote the healthy growth of children.