Does a three-year-old baby have a fever?

Under normal circumstances, the temperature of 37.3-38 degrees Celsius belongs to low fever. According to your description, the temperature of a three-year-old baby is 38 degrees Celsius, which is considered a fever and needs active treatment. You can place an ice pack on the baby's forehead to promote the temperature drop. If the temperature exceeds 38.5 degrees, you need to use antipyretic.