Baby nine months cough with sputum is mostly seen in respiratory infections, there is no most effective treatment, according to the severity of the disease to be reasonable treatment, such as bacterial infections caused by bronchopneumonia need to be anti-infective and nebulization and other treatments. For nine months old baby cough with sputum symptoms are common in respiratory tract infections, such as acute upper respiratory tract infections, acute bronchial or bronchopneumonia, can be caused by viruses, bacteria and other pathogenic infections, clinical in addition to the above symptoms, can be accompanied by fever or wheezing and other symptoms, the condition of the severity of the varying. The most effective treatment for babies with cough and phlegm does not exist, and it is up to the specialist to determine the condition and give appropriate treatment. For example, if the phlegm is thick and viscous, sputum removing drugs such as Ambroxol Hydrochloride can be taken; if bacterial infection is suspected, oral antimicrobial drugs (e.g., Cefaclor) can be used to fight infection; if the effect of oral drugs is unsatisfactory, or if the condition is more serious (e.g., bronchopneumonia), intravenous fluids should be used. All of the above medications should be used under the supervision of a physician, and it is recommended to actively seek medical attention and be evaluated by a specialist for treatment.