One and a half year old baby fever 38.5 ℃, if not accompanied by other obvious discomfort, you can first give the physical cooling, if the temperature continues to rise, can follow the medical advice to give ibuprofen and other drugs. 1. Physical cooling: you can use a warm towel to wipe the baby’s armpits, groin and other places, but also can give the baby a warm bath, you can also use antipyretic patches, etc., this kind of way can take away the body surface temperature, relieve fever symptoms. At the same time after the use of drugs also need to give the baby appropriate water to promote the body’s metabolism. 2. medication: if physical cooling is not relieved, or the temperature continues to rise, you can use medication under the guidance of a doctor, such as ibuprofen, acetaminophen, etc., to avoid fever convulsions (due to high fever caused by convulsions and seizures). One and a half year old baby fever 38.5 ℃ there are many reasons, it is recommended to reduce fever at the same time immediately seek medical attention to clarify the cause of fever, timely give targeted medication treatment, etc..