A seven-month-old baby with phlegm in his throat can take some cough expectorant medicine. Because babies are relatively small and immature in all aspects of functional development, it is likely that babies with phlegm in their throats are uncomfortable because they are too small to cough it up. If it is caused by common cold, parents do not need to worry too much and can give the baby some medicine for cold and phlegm. If the baby has phlegm in the throat caused by bronchitis or pneumonia, then we should pay attention to it and go to the hospital to take a chest X-ray or lung film if necessary. If it is determined that these two conditions are causing the phlegm in the baby’s trachea, the baby can be treated with anti-inflammatory and antibiotic medications, together with phlegm-relieving medications. You can also choose to hospitalize your baby, and if necessary, you can do nebulization, which is very effective for resolving phlegm.