You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Cyanosis in newborn that disappears on crying is seen in? and explain in detail?
*Bilateral choanal atresia is due to persistence of bucconasal membrane. Newborn, being a natural nose breather, presents with respiratory obstruction leading to cyanosis. However, if the infant cries and takes a breath through the mouth, the airway obstruction is momentarily relieved and thus cyanosis disappears. Reference : page 163 Diseases of Ear, Nose and Throat & Head and neck surgery P L Dhingra 7 th h edition