Newborns with phlegm accumulation in the throat due to foreign body irritation or inflammation have a greater impact on breathing and need timely treatment. Newborns are prone to coughing and phlegm after a cold. Because of their weak coughing ability, they need outside help to expel phlegm. Patting the back is a good way to help. The parent’s right hand, with five fingers together and the middle arch forming a hollow shape, should pat the newborn’s back where the lungs are located with moderate force for five minutes each time, three or five times a day. Pay attention to the location of the baby’s lungs are patted, especially the lower part of the lungs, where phlegm is more likely to accumulate, focusing on patting to help drain phlegm. You can also take your newborn out for walks and get some sunshine often, as the fresh air will help reduce the irritation and dryness of the lungs and prevent the formation of large amounts of phlegm, and the moist gas will help moisten the lungs and stop the cough. Hot boiled water at the right temperature can help dilute the phlegm by washing it down, and feeding more water is also a good way to dissolve it. But be careful not to drink too much water at a time to avoid increasing the burden on their urinary system and to prevent water intoxication in newborns. Sputum in the throat of newborns is a potential threat to their health, and parents can use a variety of methods to help expel it. If the sputum interferes with normal breathing and eating, the baby should seek medical attention.