Newborns with phlegm in their throats should be kept warm at this time to avoid getting cold. Pat the back from the bottom of the back upwards to facilitate the expulsion of phlegm by vibrating the phlegm in the respiratory tract of the throat. Continue breastfeeding, breast milk contains a lot of water, which helps to dilute the phlegm and promote its expulsion. In addition, breast milk is also rich in immunoglobulins and a large number of natural antibacterial factors, which can also resist the presence of pathogens. If your baby has relatively more sputum, you can always consult a doctor and use a suction machine in the hospital to suck out the sputum in the throat to avoid the spread of inflammation and prevent the emergence of bronchitis and pneumonia.