Can I use an ice pack to cool down a child with a fever?
Generally speaking, fever refers to an elevated body temperature. When a child has a fever, it is acceptable to use a cold compress as a form of physical cooling. The detailed explanation is as follows:

The principle behind cooling with a cold compress involves heat transfer, whereby the ice in the compress absorbs body heat, thereby lowering the local body temperature and helping to reduce overall body temperature. However, it should be noted that children's skin is delicate, and direct contact with the cold compress may cause skin damage or discomfort. Therefore, the compress should be wrapped in a dry towel or cloth cover before use. The cold compress can be placed on areas such as the child's forehead, underarms, or groin, where large arteries are located. However, the application time should not be too long—usually limited to 10–20 minutes each time—and should not be used continuously for more than 30 minutes to avoid frostbite.
Normally, you can encourage children to engage in more outdoor activities, strengthen physical exercise, and improve their physical fitness and immunity. At the same time, maintaining a balanced diet rich in vegetables and fruits containing vitamins, and avoiding picky or selective eating habits, can help prevent the occurrence of such situations.