In an emergency, you can use your mouth to help your baby suck up sputum because some children, especially younger children, have a very poor cough reflex and do not spit out the sputum on their own, which is trapped in the throat and causes a phlegm sound in the throat. Because there is a lot of phlegm in the throat, the cough can take a long time to heal and can affect the eating situation. At this time, parents can help the child to suck out the phlegm by mouth, because the negative pressure of the parent’s mouth can suck out the phlegm, which can improve the cough and phlegm symptoms. However, it is recommended that this be done only occasionally and only as a last resort, and that the child be taken to a hospital for professional suction treatment.