Three and a half year old baby fever IV three days after the temperature is still 37.5 ℃ may be related to the disease is not fully controlled, fever 37.5 ℃ generally can give the baby for physical cooling. Three and a half year old baby fever is usually caused by infection, through the drip three days after the temperature is still 37.5 ℃, may be the disease is not completely cured. It is necessary to be assessed by a specialist whether to continue treatment with medication. If the baby’s body temperature is 37.5 ℃, there is no obvious symptoms of discomfort, you can temporarily do not need to take antipyretic drugs, physical cooling such as the use of warm towels on the forehead, warm water to wipe the neck, armpits, thighs, and other large blood vessels, and reduce the wearing of clothing and other physical methods to lower the temperature. Give the child appropriate water to promote metabolism, to help heat discharge, some children’s body temperature can gradually decline. It is recommended to strengthen the baby’s care, regular temperature measurement, if there are other abnormalities to take the baby to the hospital for examination in a timely manner, under the guidance of the doctor’s treatment.