If a 9-month-old baby develops a cough, he or she can use medication to treat the cough. It is recommended to choose pediatric phlegm and cough granules or loquat cough granules, which are relatively safe and effective Chinese cough medicines and can provide quick relief for mild coughs. If the symptoms continue to worsen, it is also important to treat the pathogenic infection in a timely manner. Erythromycin granules or azithromycin granules can be chosen according to the test results, which are effective for coughs caused by concurrent mycoplasma infections, but require a long course of treatment, taking about 2 weeks to control the cough symptoms. If your baby has a sore throat or swollen tonsils, you should also use Chinese medicine to clear heat and detoxify the toxins, such as Jin Yin Hua granules, which can quickly improve the symptoms of a sore throat.