9-month-old baby with cold, cough and phlegm, common methods are as follows: 1. If the symptoms are not particularly serious, you can not have to feed the baby drugs, you can properly feed a little warm boiled water. 2. In addition, you can also continue breastfeeding, because breast milk contains natural immunoglobulins and antibacterial factors, can improve the baby’s resistance to cold pathogens. 3. If the symptoms of infection are serious, cough and phlegm are obvious, you can give your baby some medicine appropriately, such as you can choose pediatric lung-clearing and phlegm-suppressing cough granules, lantern leaf granules, carboxymethylstilbestrol oral liquid, aminoglutethimide syrup. You can choose to use nebulizer treatment, such as budesonide nebulizer, ribavirin nebulizer, etc. For the pathogen, if it is a bacterial infection, you can choose antibiotics, such as penicillin, amoxicillin, etc.