If a newborn has phlegm in the throat, it is often due to the following reasons: first, due to respiratory infections. If a child has neonatal bronchitis or bronchopneumonia, there is often phlegm in the throat, mainly because the child is relatively young and will not discharge phlegm on its own, thus causing phlegm to accumulate in the middle of the throat and sound whistling. In this case, you need to give your child Chinese medicine to relieve phlegm and cough, such as Jin Zhen Oral Liquid and Compound Xian Zhu Li Oral Liquid, etc.; you can also give your child nebulized inhalation treatment. Secondly, it is also very common due to laryngeal cartilage dysplasia. The child will have dysplasia of the laryngeal cartilage due to the young age or calcium deficiency, which will cause the situation of purring and phlegm in the throat.