Newborns coughing with phlegm may be caused by respiratory tract infection and bronchitis, which can be treated with nebulized inhalation and medication, etc. 1. Respiratory tract infection: newborns coughing with phlegm may be respiratory tract infection, the use of nebulized inhalation can dilute the phlegm, which can help the secretions in the airway discharge. If the newborn coughs a lot, there may be bronchial spasm, nebulized inhalation can relieve the spasm. 2. Bronchitis: bacteria in the airway in large numbers of reproduction is easy to induce bronchitis, if the bacterial infection caused by coughing phlegm, need to use amoxicillin and other antibiotic drugs treatment. If a newborn coughs with phlegm, take the child to the hospital in time, after clarifying the cause of the disease, under the guidance of the doctor’s treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.