1. Causes of baby\’s runny nose There are many reasons for baby\’s runny nose, including colds, allergies, climate change, etc. When a baby is infected with a virus or bacteria, the body produces excess mucus, causing a clogged and runny nose. When a baby is exposed to allergens, the body will overreact, causing nasal congestion and increased secretions. Climate change may also affect your baby\’s nasal mucosa, causing a runny nose. 2. How to relieve your baby\’s runny nose 1. Keep the air moist: Staying in a dry environment for a long time will dry out the nasal mucosa, making the secretions more viscous and difficult to discharge. This can be done by using