Due to their young age, babies do not express their discomfort. When a baby’s throat makes a purring sound, it may indicate that there is phlegm in the baby’s throat, but phlegm is easy to cause bacterial infection when it is in the baby’s throat for a long time. Parents can make their hands into fists and then gently pat the baby’s back in between coughing, which can loosen the phlegm in the baby’s throat and expel it outward with the airflow. And this is good for promoting blood circulation in the baby’s heart and lungs, but you have to master the strength of the patting, otherwise it is easy to hurt the baby. In addition, you can also let the baby drink more water, if the baby throat lack of water, but will increase the consistency of phlegm, so that the baby throat phlegm more difficult to discharge, drinking water can lubricate the baby’s throat, dilute phlegm, relieve local inflammation, and promote the discharge of phlegm. At the same time, parents should also often open the windows of the house, which can ensure fresh air and also promote the movement of the cilia in the throat to accelerate the discharge of phlegm. So, when the baby’s throat phlegm is difficult to expel, you can try these methods, if these methods do not work, it is best to go to the baby to the hospital in time, so that doctors use professional methods to help the baby expel phlegm.