1. Causes of fever in babies: Fever in babies may be caused by infection with bacteria or viruses, or it may be caused by tooth growth. In addition, excessive wearing or high ambient temperature may also cause fever in babies. 2. How to measure the baby\’s temperature. When taking the baby\’s temperature, you can use an electronic thermometer or a mercury thermometer. For younger babies, it is recommended to use a rectal thermometer to measure body temperature. 3. How to deal with a baby’s fever. When a baby has a fever, parents need to