A one-year-old baby with phlegm can not cough up, if the symptoms are mild, drink more water, general treatment can be; if the symptoms are heavy, need to treat the cause of the disease, symptomatic treatment and so on. 1. If the symptoms are mild, let the child rest more, ventilate the room, drink more water and keep the air with proper humidity. 2. If the symptoms are severe, it is necessary to identify the cause of the disease and then treat it. (1) Treatment of the cause of the disease: if a variety of infectious diseases, such as common viruses, no specific antiviral drugs. Bacterial infection, taking penicillin, etc. Mycoplasma infection, take azithromycin, etc.. Tuberculosis, take isoniazid, etc. Allergic diseases, avoid contact with allergens, take tylizine drugs, etc.. (2) Symptomatic treatment: cough light as much as possible to resolve phlegm-based drugs, commonly used aminobromine hydrochloride, bromohexine hydrochloride and so on. One year old babies have phlegm coughing out, try to take the child to the hospital, under the guidance of the doctor’s treatment. All of the above medications should be taken under the supervision of a doctor.