The nasal cavity is not yet mature, the nasal cavity is narrow, and the nasal mucosa is rich in blood vessels. Parents need to carefully observe the child’s nasal cavity, if it is blocked by secretions or nasal crusts, to help the child clean up as soon as possible. The correct way to clean up is: you can use a cotton swab dipped in a little warm water, gently drop into the child’s nasal cavity, wait for the secretions to soften, and then gently pull out the nasal crust. If the child’s nasal congestion is accompanied by runny nose and other symptoms, usually caused by a cold, you can use a warm towel to apply hot compresses on the child’s nose. Note: Since the baby is 20 days old, the temperature should not be too hot, about 10 minutes each time, 2 times a day.