The normal range of body temperature for a 14-year-old child is 36~37℃, if it has been 37.3℃ belongs to mildly high, may be related to overdressing, drinking too little water, chronic infections and so on. 1. Overdressing: If the 14-year-old child has been 37.3 ℃ belongs to mildly high, may be too much clothing with parents to wear or cover the quilt is too thick. 2. Drinking too little water: If a child drinks too little water, there may be a mild dehydration. There is a clinical term called dehydration fever, when the child’s body is dehydrated, the body temperature will be high. 3. Chronic infection: If a child is infected with tuberculosis bacilli or parasites, the body will develop a chronic infection, which may also result in a high body temperature. It is worth noting that the 14-year-old child’s body temperature has been 37.3 ℃, if there are other uncomfortable symptoms, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to identify the cause of the disease and carry out appropriate treatment.