1. Causes of nasal congestion in infants 2. Symptoms of nasal congestion in infants 3. How to relieve nasal congestion in infants 4. Methods to prevent nasal congestion in infants 5. When to seek medical treatment 6. How to clean the baby’s nose 1. Causes of nasal congestion in infants Many newborns and young children Nasal congestion will occur. This is because their breathing is not fully developed yet, causing mucus to build up in the nasal cavity