Although laryngomalacia is the leading cause of stridor in infancy, vocal cord paralysis, despite its low incidence, is still the second most common cause.

摘要喘鸣是一岁以下的婴幼儿呼常见的主诉，而头软化症是最常见的原。

Laryngomalacia is the most common etiology of non-infectious molluscum in infancy.Endoscopic morphology revealed abnormal droop of sub-glottis structures in inhale.

软化是婴儿期最常见的非传染性喘鸣的病,内镜检查显示,气时声门上有异常的下垂。