Twenty-day-old baby’s nose is not ventilated, the first thing to analyze is what is the cause. First, it is important to consider whether there is an upper respiratory tract infection, or whether someone in the family has an upper respiratory tract infection that has caused the spread of the respiratory tract. To observe whether the child’s body temperature is feverish. Second, to see if the child usually eats milk normally, whether there is a few bites of milk, then dropping the nipple and then a few breaths of air, indicating that there is indeed occlusion. Third, we should observe whether there is obvious snoring during sleep, whether there is continuous open-mouth breathing, or whether there is an obvious depression of the chest. After the child is asleep, parents can use a flashlight to see if the nasal cavity is clogged with obvious, lumpy secretions, and if there is indeed such a condition, you can use small tweezers to gently clip it out. After these conditions are ruled out and there is still occlusion, one should rule out any congenital disorders, such as adhesions in the nasopharynx, or developmental malformations, as well as any softening of the laryngeal cartilage, which requires a visit to the ENT or pediatric department of the hospital.