The newborn’s respiratory system is not well developed and mature enough, and the lack of respiratory secretory IgA makes it easy to cause respiratory tract infections and not easy to expel the phlegm from the body. At this time, you can give your baby more patting on the back, patting with appropriate strength. Continue breastfeeding, the large amount of water contained in breast milk can dilute the baby’s sputum and promote the excretion of sputum. If the sputum is sticky and not easy to be expelled, you can choose nebulizer inhalation treatment, or even aspirator aspiration. Parents are advised to bring their children to the neonatology department in a timely manner. Follow up at any time to adjust the treatment plan.