hello dr, my son is 4 yrs old. he is having cough since 2 months, he not much cough during the day but at night he coughs alot. Last year in -feb-march, he had the same attack with fever. he had same problem in last to last year( when he was 2yrs old) also dr. in the same months during feb-march. No cough medicine work on it during that period of time. When ever there is a change in weather he get sick.