The following measures can be used to deal with a five-week-old child with a bad cough: first of all, promptly get antibodies against mycoplasma, because some five-week-old children always have a bad cough because they are infected with Mycoplasma pneumoniae, which has a very abnormal structure and is firmly attached to the mucous membrane of the respiratory tract, thus causing a bad cough. The treatment can be carried out promptly after the positive blood test for mycoplasma antibodies. Secondly, Meprobamate should be administered promptly. The cough of a five-week-old child with a bad cough is caused in large part by cough variant asthma, which is more severe at night and in the morning, and is characterized by a dry cough with little sputum. In addition, foreign body inhalation should be ruled out and, if necessary, a chest CT examination should be performed to clarify the diagnosis.