Infants and young children have small nasal cavities and rich nasal mucosa with blood vessels. They are prone to inflammation and runny nose, which can block the baby\’s nasal cavity. The baby may cry, be irritable, and be unwilling to eat. Babies who are irritated by cold air may have a runny nose due to sensitivity. If the runny nose is only in the morning, it is often caused by allergies. This kind of nose is watery. In addition, colds and colds can also cause a runny nose, which may be watery in the early stage and become…