If a 3-4 month old baby has a cough, it is important to observe the baby’s condition. For example, if the child has a stuffy nose and runny nose with a mild cough, it may be an infection of the upper respiratory tract, and the child can be treated with Pudilan anti-inflammatory oral solution, and can also be treated with aminoglutethimide oral solution to stop the cough and dissolve the phlegm. If the child has a deep cough with a high fever, it is likely to have bronchitis or pneumonia, and it is not possible to take oral medication at home at this time. In general, the treatment can be intravenous cephalosporin antibiotics, antiviral drugs, nebulized inhalation drugs can choose terbutaline sulfate and budesonide, these two drugs can reduce the child’s trachea, lung local inflammatory response and dilate the bronchial tubes.