There is no fastest way to get rid of phlegm in children, and treatment needs to be individualized according to the cause. Children with phlegm are often caused by respiratory infections, including upper respiratory tract infections and lower respiratory tract infections, can be treated through general treatment, oral medication, nebulizer treatment. 1. General treatment: you can let the child drink more warm water, maintain indoor humidity is conducive to the inhalation of air in a humid state, can make the phlegm dilution, help the child to cough up phlegm; through the back patting, can play the role of vibration of phlegm expulsion. 2. Oral medicine: you can choose to apply the expectorant medicine such as Ambroxol Hydrochloride Oral Liquid under the guidance of the physician, and if the bacterial infection is combined at the same time, you need to apply the antibacterial medicine such as Cefixime tablets and Azithromycin granules to treat it. 3. Nebulization therapy: you can choose to inhale acetylcysteine, which can effectively inhibit airway reaction and relieve respiratory inflammation. It is recommended to go to the hospital, under the guidance of the doctor to correctly apply the drug treatment, you can not randomly use drugs.