If the baby has phlegm, coughing and vomiting, it is recommended to actively seek medical treatment, complete the blood routine, chest X-ray and other related examinations, and clinically can take symptomatic treatment as well as causative treatment. For symptomatic treatment, expectorant drugs, such as Mucosolvan, can be used when there is phlegm that cannot be coughed up. If a child has a fever that exceeds 38.5℃, antipyretic treatment is needed, and commonly used medications include ibuprofen and acetaminophen tablets. If the temperature does not exceed 38.5℃, physical cooling is clinically possible, such as warm water baths and fever-reducing patches. The treatment of the cause refers to the assessment of the causative organisms of the possible infection on the basis of the complete blood routine, chest X-ray and other relevant examinations, according to the causative organisms to take targeted treatment, for example, bacterial infections need to be treated with antibiotics, viral infections need to be treated with purging and detoxification or antiviral medications, and mycoplasma infections can be treated with erythromycin and other relevant medications.