In most babies, coughing may persist for some time after the respiratory infection has been cured. This is due to the fact that after a respiratory infection, the baby’s respiratory mucosa is damaged and when stimulated by viruses or mycoplasma, as well as allergens and clothing, coughing symptoms may occur, which do not need to be treated at this time. If the cough has phlegm, inhalation of budesonide suspension and ipratropium bromide powder suspension can be given to reduce the inflammatory response of the airway mucosa, and most of the symptoms can be relieved. If you have a prolonged cough, you should also pay attention to the presence of allergic cough or recurrent respiratory tract infections. If necessary, orthopantomogram of the chest and routine blood tests and Mycoplasma pneumoniae tests are needed to find the cause of the disease and to intervene to treat the cause.