It is important to clarify whether the asthma is caused by wheezing bronchitis, bronchial asthma or pneumonia, and to provide different treatments according to the specific cause. Most babies under 2 years of age have wheezing bronchitis caused by viral infections, which can be treated with symptomatic treatment such as wheezing, nebulized inhalation, cough and sputum removal. In case of bacterial infection, antibiotic treatment is required and the duration of the disease is usually about 2 weeks. In case of bronchial asthma, long-term standardized hormone nebulizer treatment, such as budesonide nebulizer inhalation, is required. If it is caused by pneumonia, the diagnosis can be confirmed by checking the chest X-ray and lung CT to see obvious film shadow, which requires hospitalization with antibiotics and nebulized symptomatic treatment.