Hypoplastic laryngeal cartilage is a disease caused by malnutrition during maternal gestation, especially in the second trimester, or by weakness, or by premature birth of newborns, or low birth weight babies, or by calcium deficiency or electrolyte disturbances during infancy. The condition is characterized by softening of the cartilaginous structures of the larynx, laryngeal tinnitus and dyspnea after vigorous crying or activity. Laryngoscopy reveals a softening of the epiglottis as well as the epiglottis, which causes narrowing of the vocal chambers during inspiration due to negative pressure gathering toward the vocal chambers. If the symptoms are relieved by laryngoscopy, the disease can be identified. The laryngeal cartilage dysplasia usually does not require special treatment. Usually, attention should be paid to avoid fright, frightened crying and other triggers, strengthen nutrition, correct electrolyte disorders, and enhance physical fitness by regular sunlight. Most children will gradually get better at the age of 2-3 years as the laryngeal cavity develops.