Children coughing phlegm lying down on the cough, this is due to lying down, the body position changes, resulting in phlegm downward flow, stimulate the throat, so there will be a cough reflex intensification of the performance, the treatment should be directed at the original disease to carry out treatment. Children coughing phlegm is often a symptom of respiratory tract infection, treatment should be aimed at respiratory tract infection to be treated, if it is caused by bacterial infection, can be amoxicillin clavulanate potassium, azithromycin and other drugs for antibacterial treatment as prescribed by the doctor. If the baby rhinitis caused by upper respiratory cough syndrome, can be negative pressure suction under the guidance of a doctor to clean up the nasal cavity, if necessary, can be added to the cetirizine and other drugs such as anti-allergy treatment, plus mometasone furoate nasal spray nasal anti-inflammatory and anti-allergy treatment. If the combination of bacterial infection can be added with drugs such as erythromycin anti-infection treatment. In addition, some gastroesophageal reflux and other diseases can also lead to the baby lying down coughing, if the child coughing phlegm lying down coughing symptoms, should be timely consultation, please doctor to deal with.