Diagnosis and Management of High-Pitched Sounds in Infants

Most Likely Diagnosis: Laryngomalacia

Laryngomalacia is the most common congenital laryngeal anomaly and the most frequent cause of persistent stridor in children, accounting for the majority of cases of noisy breathing in infants, according to the European Respiratory Journal 1
Severe respiratory distress, oxygen desaturation, or apnea during the noisy breathing episodes require immediate otolaryngology referral and laryngoscopy 1

Associated hoarseness or abnormal cry, which could indicate vocal fold paralysis, laryngeal webs, or other serious congenital anomalies, as stated by the American Academy of Otolaryngology-Head and Neck Surgery 2, 3, 4
Poor feeding, failure to thrive, or dysphagia, suggesting more severe airway obstruction or underlying neurological issues, as noted by the American Academy of Otolaryngology-Head and Neck Surgery 4
Stridor with other neurological symptoms, as this may indicate Arnold-Chiari malformation, hydrocephalus, or posterior fossa mass, according to the American Academy of Otolaryngology-Head and Neck Surgery 2, 4

Vocal fold paralysis (third most common congenital laryngeal anomaly), often related to birth trauma, intracranial processes, or mediastinal pathology, as stated by the American Academy of Otolaryngology-Head and Neck Surgery 2, 1, 4
Tracheomalacia or bronchomalacia, which can cause persistent wheezing and noisy breathing, according to the European Respiratory Journal 1
Laryngeal webs, stenosis, or other congenital anomalies that require early identification, as noted by the European Respiratory Journal and the American Academy of Otolaryngology-Head and Neck Surgery 1, 4

Flexible laryngoscopy should be performed to visualize the larynx in physiological conditions and assess laryngeal structure and function during inspiration and expiration, as recommended by the European Respiratory Journal 1
The American Academy of Otolaryngology-Head and Neck Surgery guidelines state that neonates with dysphonia should undergo laryngoscopy to identify vocal fold paralysis, laryngeal webs, or other congenital anomalies that might affect swallowing or breathing 3, 4
Examination of both upper and lower airways is important, as concomitant abnormalities below the epiglottis are found in up to 68% of cases, according to the European Respiratory Journal 1