37.8 ℃ is only a low fever, 2 years old baby fever at night, generally is sleeping, in order not to affect the child’s sleep, this time you can give the baby to take physical cooling methods. Generally, the baby’s forehead, neck, armpit paste cooling paste to assist in reducing fever, will not affect the child’s sleep, you can also use warm water to baby bath, also will not affect the child’s sleep. If the axillary temperature is >38.5℃, the baby should be woken up and given fever-reducing medicine, usually ibuprofen or acetaminophen. If the effect of fever reduction is not obvious after taking antipyretic drugs, you can give your baby a warm bath and feed him/her more water to help reduce fever. If your baby still has recurrent fever or other clinical symptoms, it is important to see a pediatric emergency room in a timely manner.