Three and a half months of baby cough according to different performance to give different interventions, if the cough is irritating dry cough, no sputum, and cough a very high number of times, sometimes accompanied by fever, breastfeeding and other symptoms, generally for the acute upper respiratory tract infections caused by viral infections, as well as pharyngeal congestion and stimulation of the cause, can be given to the application of antiviral drugs to observe. If the cough with phlegm, but not accompanied by obvious dyspnea, mental state is still good, generally caused by bronchitis, can be given to apply cephalosporin antibiotics and cough and phlegm Chinese patent medicines treatment. If the cough is accompanied by wheezing, increased respiration and decreased milk intake, it is necessary to pay attention to the possibility of the existence of wheezing bronchitis, which progresses more rapidly and requires timely consultation in the hospital.