A three-year-old baby has a strong cough at night for the following reasons: a. Allergic cough, which is induced by contact with allergens, is diagnosed by going to the hospital for relevant tests. After the diagnosis is confirmed, anti-allergy treatment should be actively done, and cetirizine drops can be used. Drink plenty of water and monitor your body temperature to avoid fever. Second, probably caused by bronchial infection, or pneumonia, to go to the hospital to let the doctor to perform lung auscultation, if necessary, film to confirm the diagnosis. If the infection is mild, anti-inflammatory drugs can be taken. If there is phlegm, remove the phlegm first, and use fresh bamboo oral liquid or pediatric Magan granules. In severe cases, give the child fluids. Third, Chinese medicine says that Yin deficiency dry cough is usually serious at night. Treatment is based on anti-inflammatory drugs and cough medicines, but also pay more attention to rest and drink more water.