If a baby has a fever with teeth clenching, it may be the following cases: 1. High fever with convulsions occur. Because of the skeletal muscle convulsions, tension, and thus the phenomenon of clenching teeth, most of them are benign febrile convulsions, and most of them will relieve themselves in about 2-3 minutes of convulsions. If the convulsion occurs for more than 5 minutes, it may cause some damage to the brain, parents should lay the baby on its side, put gauze or chopsticks in the mouth to avoid biting the tongue, and then promptly go to the hospital. 2, there may be high fever with chills, mostly in older children, general chills, teeth chattering phenomenon, to monitor the body temperature, timely application of antipyretic drugs, and then promptly seek medical attention.