If a four-month-old child has a cough caused by bronchitis, the following methods can be used to improve it: first, the child can be treated with nebulized inhalation. Nebulized inhalation medications, such as budesonide suspension and Advil, can have a good effect on phlegm and cough, and the nebulized inhalation method can act directly on the child’s respiratory tract, with a high local drug concentration and a very direct effect on phlegm and cough, which can be accepted by the child and will not cause a systemic reaction in the child. Second, children can be treated with phlegm-suppressing drugs. These two drugs have good effect in reducing phlegm and cough, and most children can recover from bronchitis after taking them for about a week. Finally, children can also be improved by using the method of stewed pear with 3g of Sichuan peel, which can be boiled with a pear.