I wouldn't rush to the hospital unless the temperature was very high, over about 104 - 105. If the temperature is under 102, use fever reducing medicine (tylenol, advil) only if the child is acting sick. A low grade fever means that the body is fighting the infection. If temperature is over 102, give tylenol or advil according to instructions. If child is still feverish tomorrow, go to the doctor.
Mom of 2 age 17 and 25.