However, dystonia in the laryngeal adductor muscles has also been reported to cause laryngeal stridor. [ncbi.nlm.nih.gov]

Other symptoms may include: difficulty feeding poor weight gain choking while feeding apnea (pauses in breathing) pulling in neck and chest with each breath cyanosis (blue spells) gastroesophageal reflux (spitting, vomiting and regurgitation) Inhalation [childrenshospital.org]

In more severe cases of laryngomalacia, there may be: Vomiting or spitting up food (reflux) Poor weight gain Difficulty eating Choking on food Pauses in the breathing (apnea) or turning blue (cyanosis) Chest or neck sinking in when breathing (retractions [nationwidechildrens.org]

[…] upper respiratory infection, like a cough or cold Other symptoms of more severe congenital laryngeal stridor can include: Difficulty feeding Poor weight gain Choking while feeding Apnea (pauses in breathing) Pulling in neck and chest with each breath Cyanosis [cooperhealth.org]

Examination When examining the infant check for: cyanosis degree of respiratory distress nature of stridor ability to feed choanal patency jaw and tongue size auscultation (transmission of breath sounds). [www2.health.vic.gov.au]

[…] congenital aetiology History of foreign body aspiration Hoarseness of voice in the past Clinical examination: Upper airway examination for any visible obstructive lesion Examination of cardiovascular system To note signs of respiratory distress and cyanosis [specialist-ent.com]

Muller J, Wenning GK, Verny M, McKee A, Chaudhuri KR, Jellinger K, Poewe W, Litvan I: Progression of dysarthria and dysphagia in postmortem-confirmed parkinsonian disorders. Arch Neurol 2001;58:259–264. [karger.com]