4-year-old baby cough 5 months has not been well, can be seen in recurrent respiratory tract infections, cough variant asthma or upper airway syndrome, etc., according to their specific situation to analyze and judge. 1. recurrent respiratory infections: for 4-year-old baby, is at the beginning of kindergarten stage, the age of exposure to environmental changes, coupled with its immune function and other weak, easy to recurring cough has not been good phenomenon. Some babies with underlying diseases, such as coronary artery disease, more likely to appear the above phenomenon, need to pay attention to the regular full course of treatment, to avoid stimulating factors, strengthen the body and strengthen nutrition. 2. Cough variant asthma: no formal treatment can appear cough for a long time, has not been a good phenomenon, this kind of baby cough presents dry cough, mostly at night after activities, etc., lung function test can be seen in the reactivity increase. 3. Upper airway syndrome: such as rhinitis – sinusitis, nasal polyps, etc., can affect the discharge of nasal secretions, secretion reflux stimulation of cough symptoms, without formal intervention can also occur. 4. Other: such as tracheal foreign body, often with a history of foreign body choking, chest CT examination and bronchoscopy can assist in the diagnosis, such children due to local foreign body stimulation of the respiratory tract, may also appear above phenomenon. 4-year-old baby cough for 5 months has not been good, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.