When a three-and-a-half-year-old baby has a strong cough, the first thing to do is to observe the accompanying symptoms, such as nasal congestion, runny nose, sore throat or coughing and coughing, which are often caused by respiratory infections and can be treated with anti-inflammatory drugs and cough and phlegm medicines. First of all, in the early stage of coughing, it is recommended to use Chinese anti-inflammatory drugs, such as Pudilan Anti-inflammatory Oral Liquid or Blue Scutellaria Oral Liquid. If it is a cough suppressant and phlegm remover, you can choose Lung Power Cough Compound, Compound Fresh Bamboo Liqueur or Aminoglutethimide Oral Solution, all of which are relatively effective. If there are no accompanying symptoms and an irritating cough suddenly appears, there may be an allergic cause, but, often with a history of exposure to allergens, it is important to first get rid of the allergen and then treat it with anti-allergy medication. For three-year-old babies, it is recommended to use desloratadine for anti-allergy treatment. There is also the possibility of cough variant asthma, which needs to be treated with nebulized inhalation of terbutaline sulfate and budesonide.