The baby sleeps with a laryngeal sound may be due to tonsil inflammation, throat infection and congenital laryngeal cartilage dysplasia and so on. 1. Inflammation of the tonsils: when the tonsils are inflamed, the tonsils will be swollen due to the stimulation of inflammatory factors, which will make the narrowing of the throat, the baby sleeps at night breathing is not smooth, the airflow through the narrowing of the voice will be issued. 2. Throat infection: after being infected by bacteria, viruses and other pathogenic microorganisms in the throat, the mucous membrane of the throat will secrete inflammatory secretions, and if the baby’s breathing is obstructed by these secretions at night, laryngeal tinnitus may occur. 3. congenital laryngeal cartilage dysplasia: congenital laryngeal cartilage dysplasia babies, sleep inhalation laryngeal cartilage will be collapsed inward, blocking the airway, thus causing laryngeal tinnitus. The laryngeal sounds may also be related to other causes, we should go to the hospital as soon as possible, by the doctor according to the specific conditions of the diagnosis and treatment plan.