Level 1: The reason why the baby has recurrent fever may be caused by infection with viruses or bacteria, or it may be due to immature immunity that is easily affected by the environment. In addition, if the baby is born underweight, prematurely born, or the mother is infected, it may also cause the baby to have repeated fevers. Level 2: How should I check my baby’s temperature? When checking your baby\’s temperature, you can use an electronic thermometer or infrared forehead temperature. For newborns and under 3 months