Level 1: Causes of nasal congestion in newborn babies There are many causes of nasal congestion in newborn babies, the most common of which are colds, allergic rhinitis, climate change and dry air. Since babies\’ immune systems are not yet fully developed, they are easily affected by these factors. In addition, newborn babies have very small noses and their nasal passages are easily blocked. Level 2: Symptoms of nasal congestion in newborn babies When newborn babies have nasal congestion