Introduction When babies are around seven months old, their immunity has not yet been fully formed and they are often susceptible to various diseases. Among them, cough is one of the most common symptoms. When a baby coughs and produces phlegm, if measures are not taken in time, it will not only affect the baby\’s sleep and appetite, but may also cause other diseases. Therefore, parents need to understand the causes and treatment methods of babies coughing with phlegm to help them