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Q30.0 Choanal atresia Choanal atresia is a blockage in the back of a baby’s nose that makes it hard to breathe. It’s often seen in newborns with other birth defects, such as Treacher Collins syndrome or CHARGE syndrome. The types There are two types of choanal atresia: Bilateral choanal atresia. This type blocks both nasal passages. It’s very dangerous because babies breathe only through their noses for the first four to six weeks of life. Unilateral choanal atresia . This type only blocks one nasal passage, often the one on the right. It’s more common than bilateral choanal atresia. Babies with this form may be able to compensate by breathing through the one open side of their nose. Both types of choanal atresia are further categorized depending on the type of blockage: The blockage is made up of both bones and soft tissues. About 70% of babies with the condition have ...