Usually, a small child’s body temperature within 38 degrees Celsius is considered low fever, and over 39 degrees Celsius is considered high fever. If a child has a fever of 39 degrees, it is a high fever phenomenon. There are many causes of high fever in children, so it is necessary to diagnose and treat them according to their condition. First, parents can physically cool the child by removing some clothing and wiping the child’s body with warm water to dissipate heat. Secondly, you can take the relevant children’s fever medicine, and always have some emergency medicine for children at home. Take the medicine strictly according to the dose, not too anxious and take too much, otherwise it will be the opposite. Finally, you should send your child to the hospital for a routine blood test to find out the cause of the disease. The body of a child is not yet fully developed, any disease may cause fever, so it is important to identify the cause, follow medical advice, and treat the symptoms. The children’s resistance is not as strong as adults, and they are more sensitive to their surroundings and the temperature difference between day and night, so parents should always pay attention to the changes in their children’s body temperature when they take them, don’t dress them too thickly, add or remove clothing appropriately, keep them ventilated, and give them more warm water to help prevent inflammation.