Coughing in infants may be caused by acute pneumonia, upper respiratory tract infection, allergic cough and other factors. 1. Acute pneumonia: the stimulation of inflammation in the lungs may lead to coughing symptoms in infants, and most of the patients will also be accompanied by fever and malaise. 2. Upper respiratory tract infection: Inflammatory reaction of respiratory tract mucosa, usually with obvious congestion, edema, etc., which will lead to the symptoms of cough in infants. 3. Allergic cough: If infants inhale allergens such as pollen, dust mites, animal hair, etc., they may irritate the mucous membrane of the respiratory tract, thus causing an allergic cough, which is usually a dry cough. If an infant develops cough symptoms, it is recommended to go to the hospital in time, after a clear diagnosis of the cause of the disease, and actively cooperate with the professional doctor’s treatment, so as not to delay the condition.