If your child’s body temperature is less than 35℃, you should check whether your child’s limbs and trunk are warm, if they are warm, you may consider that the temperature measurement may be inaccurate, and you can retest the temperature again. If the temperature is normal, there is no need to deal with, if the temperature is still lower than 36 ℃, it is considered to be hypothermia, you should immediately give the baby to keep warm, such as adding more clothes, cover the quilt or use a hot water bag to the child to warm up, but be careful to prevent burns. After the above treatment, you should take your child to the pediatric emergency room as soon as possible to check the cause of hypothermia and treat the cause. Usually the cause is insufficient dietary intake, acute gastroenteritis or poor digestion, or insufficient calories, and should be treated with proper dietary management.