Cyanosis in newborn that disappears on crying is seen in?

*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