3-year-old baby fever and cough well see cool air runny nose may be outside and nasal temperature difference caused by physiological conditions, may also be respiratory tract infection, rhinitis and other pathological factors. 1. outside and nasal temperature difference: 3-year-old baby fever and cough good see cool air, due to the temperature difference between the outside temperature and the baby’s nasal cavity temperature difference is too large, stimulate the nasal mucosa appearing clear nasal discharge, is a normal physiological phenomenon. 2. respiratory infection: if the 3-year-old baby fever and cough is good, but there is a respiratory infection, there may be a cool air runny nose, may also be accompanied by coughing, sneezing and other symptoms. 3. rhinitis: because the temperature is too low will induce rhinitis attack, itchy nose, sneezing, runny nose and other symptoms. 3-year-old baby fever cough well see cool air runny nose, there may be other reasons, it is recommended to go to the hospital in a timely manner, to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.