Laryngomalacia (literally, `soft larynx`) is the most common cause of stridor in infancy, in which the soft, immature cartilage of the upper larynx collapses inward during inhalation, causing airway obstruction. It can also be seen in older patients, especially those with neuromuscular conditions resulting in weakness of the muscles of the throa.....
A soft floppy larynx. ... (12 Dec 1998) ... 
Type: Term Pronunciation: lă-ring′gō-mă-lā′shē-ă Definitions: 1. The presence of soft laryngeal cartilage, especially of the epiglottis, in infants, resulting in inspiratory stridor. Synonyms: chondromalacia of larynx
Laryngomalacia: A soft floppy larynx (voice box).