If your baby has snot inside the nasal cavity, it is likely to be due to cold and flu. Because there are glands in the nasal cavity, after being stimulated, the secretion of the glands will increase, and then the mucus secreted is nasal mucus. And the baby’s nasal cavity is narrower, if it is clear snot can flow down, if it is slightly sticky snot may stick to the lumen, causing the narrowing to be more obvious, which may cause nasal congestion and snot whistling. At this point, you need to see if the child’s throat is inflamed or if the tonsils are enlarged. If the snot is particularly loud or the nasal congestion is particularly bad, you can use a nasal aspirator and then draw the snot out, which can also relieve your child’s symptoms.