Cough caused by only two reasons, first is the upper respiratory tract inflammation caused by coughing, in order to laryngitis majority, and the second is a cough caused by lower respiratory tract, including bronchitis and pneumonia, etc.
Cough in children, mostly pre-flu symptoms, associated with symptoms or complications like. Some babies appear first pharyngeal itching, sore throat, cough, 23 days after the fever, stuffy nose, headache and so on, then cough became the first symptom of a cold.