<prompt> Most common presentation of infant with bilateral choanal atresia:Difficulty in breathingDysphagiaSmilingDifficulty in walking  <response>: Ans. is a i.e. Difficulty in breathing Choanal atresia is usually UL. If it occurs bilaterally the neonate presents with difficulty in breathing as infant is a nose breather and does not breathe from mouth. The neonate may have asphyxia and bilateral blockage of nose that also makes suckling difficult. UL atresia presents with nasal obstruction including snoring but goes unidentified till adult life. 