40 days of the baby’s throat whistling old phlegm causes pneumonia, upper respiratory tract infections, etc., need to choose the treatment according to the cause of the disease. 1. Pneumonia: infant pneumonia, mainly manifested as fever, nasal fluttering, foamy mouth, phlegm in the throat, fever, cough, etc., such as bacterial infections need to be given antibiotics such as cefozoxime, etc., can be perfected sputum culture, according to the causative organisms to choose an effective antibiotic, can be added to budesonide, salbutamol, etc., if necessary, the drug can be used budesonide, salbutamol and other medications nebulized inhalation treatment. 2. Upper respiratory tract infection: viral and bacterial infections lead to upper respiratory tract involvement, nasal secretions increase, breathing is not smooth, the child appears fever, coughing symptoms, can be accompanied by laryngeal popping, but the baby will not cough up sputum, resulting in sputum can not cough up, comply with the doctor’s orders to be suction care, usually can give the child patting the back, so that the vibration of sputum, to promote discharged. If a 40-day-old baby has phlegm ringing in the throat, it is recommended that the child be taken to the hospital and treated with medication under the guidance of the doctor.