If a three-year-old baby has a dry cough, he can take oral cough drops first. If the effect is not good, nebulization can be performed, because the effect of nebulization is more direct and can effectively relieve the coughing situation. If the cough is prolonged and there is no sputum, while not accompanied by other conditions such as fever, and the general condition is relatively good, we should consider whether it is an allergic cough in combination with whether the child has allergies. If the cough is allergic, you can take oral cough drops and leukotriene blockers such as cisplatin to reduce airway hyperresponsiveness. The above questions are for reference only. Please refer to the doctor’s instructions for specific medication and treatment.