Stridor congenital - anomaly of development of an external ring of a larynx. It is taped at early children's age. The epiglottis is soft and combined in a tubule. Whistling sonorous hum during an inspiration is characteristic. Its intensity decreases during a dream and, on the contrary, is enlarged at excitement, cry, tussis. The general condition remains quite good, the voice is kept. The phenomena of a stridor usually by 6 months of a life decrease and by 2-3 years disappear completely.