Level 1: Symptoms of infant cough with phlegm: 1. Infants have frequent dry coughs that last for a long time; 2. There is obvious chest tightness and shortness of breath; 3. Breathing sounds become thicker, and even wheezing occurs; 4. Phlegm is thick and difficult to pass. In response to these symptoms, parents should take appropriate measures in a timely manner to relieve their baby\’s discomfort. Level 2: How to relieve the discomfort of babies with cough and phlegm. 1. Maintain indoor air circulation to avoid accumulation of excessive dust and bacteria. 2. Increase the indoor humidity appropriately. You can use a humidifier or