What is the reason why a child's throat always has phlegm?

Patient's question:

No

Doctor's answer:

The respiratory system of infants and young children is not fully developed. If they have phlegm, they may not cough it up and it can easily get stuck in the throat, trachea, or be swallowed into the stomach. Parents should help their children clear the phlegm in a timely manner.
If a baby has a lot of phlegm, it is recommended to drink more warm water; keep the indoor air fresh and open windows for ventilation frequently; increase rest time and ensure adequate sleep, and you can adopt a side-lying position.