For a 3-year-old baby with cough, blood tests and chest x-ray can be performed. Through blood and image analysis, if the cough is caused by a viral infection, symptomatic treatment with antiviral drugs can be used. If the cough is caused by a bacterial infection, symptomatic treatment with antibiotic drugs such as cefixime granules and azithromycin syrup can be used. However, azithromycin syrup is more irritating to the gastrointestinal tract and may cause abdominal distention and indigestion in children. Bambuterol oral solution can be taken orally, which can dilute the phlegm and promote the discharge of phlegm, and enhance the anti-inflammatory effect of antibiotics when taken at the same time with antibiotics. Oral Chinese medicines can be taken, such as An’er Ning granules, Tong Xuan Ruling Lung granules, and pediatric cough and phlegm granules to relieve cough and resolve phlegm. Children can drink more water when they cough, which is good for the dilution of phlegm and can promote the discharge of phlegm. It is important to eat a light diet with less spicy and oily food to avoid aggravating the cough symptoms and causing the cough to persist.