1. Causes of nasal congestion in infants There are many causes of nasal congestion in infants, common ones include colds, allergies, climate change, indoor air pollution, etc. Because the baby\’s nose is small, it is easily blocked, causing difficulty in breathing and affecting sleep and eating. 2. How to relieve infant nasal congestion 1. Clean the nasal cavity: use saline or nasal drops to clear the nasal cavity