Newborn fever 38.4 degrees belongs to the moderate degree of fever, generally speaking is not particularly serious, but the specific still need to look at the condition, you can first take physical cooling, if necessary, follow the doctor’s instructions for drug treatment. If the newborn fever 38.4 degrees is caused by acute upper respiratory tract infection, mental state is good, only nasal congestion, nasal discharge, etc., it is not serious, you can use physical cooling, to the newborn with a warm wet towel to wipe the blood vessels, such as the palms of the hands, feet, and so on, repeatedly wiping to cool down the temperature, and pay attention to measuring temperature, as well as timely access to medical care. If the newborn fever 38.4 degrees persistent and more than 38.5 degrees, the mental state is poor, accompanied by refusal to breastfeed, crying, etc., the condition of the Cohen that is more serious, you need to consult a doctor in a timely manner, to clarify the cause of repeated fever to give targeted treatment. Newborns in all aspects of functional development is not perfect, so once the fever and other problems, must be timely medical treatment, such as the need for medication, must be used under the guidance of a doctor, so as to avoid more serious conditions, the danger.