Introduction

Laryngomalacia stands as the most common cause of noisy breathing, or stridor, in newborns and infants, accounting for up to 75% of all congenital airway anomalies.^3,6,7 Characterised by the collapse of the soft, immature tissues above the vocal cords during inspiration, this condition often presents within the first weeks of life and can range from mild, self-limiting symptoms to severe respiratory distress.^5,8 While many children experience only mild breathing difficulties that resolve as they grow, a significant subset faces more complex challenges, including feeding difficulties, failure to thrive, and even life-threatening episodes of cyanosis or apnea.^3,4,8

Pathophysiology of laryngomalacia

Laryngomalacia literally means "soft larynx," referring to the abnormal flaccidity of the supraglottic laryngeal tissues, including the aryepiglottic folds, arytenoid cartilages, and epiglottis.^4,5,6 During inspiration, negative intrathoracic pressure causes these lax tissues to collapse inward, partially obstructing the airway and generating the hallmark inspiratory stridor.^3,4,6 The classic anatomical findings include:

• Shortened aryepiglottic folds
• Omega-shaped, curled epiglottis
• Redundant mucosa over the arytenoids^4,8

The underlying aetiology is multifactorial, with proposed mechanisms including delayed maturation of laryngeal cartilage, neuromuscular immaturity, and abnormal integration of neural control over laryngeal tone.^8,10 In most cases, it presents within the first few weeks of life, peaking in severity at 6–8 months, and resolves by 12–24 months as the airway matures.^6,10

Clinical presentation

Symptoms

The primary symptom of laryngomalacia is inspiratory stridor, which is often described as a high-pitched, squeaky noise that worsens with feeding, crying, agitation, or lying supine.^1,6,7 The severity of symptoms can vary:

• Mild: Intermittent noisy breathing without feeding or respiratory difficulties
• Moderate: Frequent noisy breathing with feeding-associated symptoms such as cough, choking, regurgitation, and cyanosis during feeding
• Severe: Persistent stridor, respiratory distress, feeding difficulties, poor weight gain, apnea, or cyanosis^5,10

Symptoms typically intensify in the first few months and then gradually improve as the infant grows.⁶

Associated conditions

A significant proportion of infants with laryngomalacia also experience gastroesophageal reflux disease (GERD), which can exacerbate airway symptoms and complicate management.^5,7,9 GERD may lead to further irritation and swelling of the laryngeal tissues, worsening airway obstruction.

Diagnosis

Diagnosis is primarily clinical, based on history and physical examination, with confirmation via flexible fiberoptic laryngoscopy.^5,6,10 Key findings include inward collapse of supraglottic tissues during inspiration, omega-shaped epiglottis, and redundant arytenoid mucosa.^4,10 In severe or atypical cases, direct laryngoscopy under anaesthesia may be necessary to rule out other airway lesions or synchronous airway abnormalities.⁶

Management

Conservative management

Most cases of laryngomalacia are mild and self-limiting, requiring only observation and reassurance.^5,6,7

•  Positional therapy (keeping the infant upright during feeding and sleep)
•  Treatment of associated GERD with anti-reflux medications^5,7,9

Surgical intervention

In Severe cases, respiratory distress, feeding difficulties, or failure to thrive may require surgical intervention. The standard procedure is supraglottoplasty, which involves trimming the redundant supraglottic tissues to open the airway.^5,6 Tracheostomy or non-invasive ventilation may be considered in rare, life-threatening situations.⁶

Laryngomalacia and its relationship with other airway conditions

Synchronous airway lesions

Up to 20% of infants with laryngomalacia have synchronous airway lesions, most commonly tracheomalacia and bronchomalacia[8]. These conditions share a similar pathophysiological basis—flaccidity and collapse of airway structures during respiration—and may coexist, compounding airway obstruction and complicating clinical management[8].

Tracheomalacia and bronchomalacia

• Tracheomalacia: Characterised by excessive collapsibility of the tracheal walls, often presenting with expiratory stridor, wheezing, or recurrent respiratory infections⁸
• Bronchomalacia: Involves the mainstem bronchi and presents with similar symptoms to tracheomalacia⁸

The presence of tracheomalacia or bronchomalacia in infants with laryngomalacia increases the risk of severe respiratory compromise, recurrent infections, and prolonged symptoms[8].

Tracheoesophageal fistula and esophageal atresia

Infants with congenital tracheoesophageal fistula (TEF) and oesophagal atresia have a higher incidence of airway anomalies, including tracheomalacia and, less commonly, laryngomalacia.⁸

Other associated airway conditions

• Subglottic Stenosis: Narrowing of the airway below the vocal cords may coexist with laryngomalacia, especially in infants with a history of prolonged intubation or congenital anomalies. This can further compromise airway patency and complicate management
• Vocal Cord Paralysis: May present with noisy breathing and feeding difficulties similar to laryngomalacia. Flexible laryngoscopy is essential to distinguish between these entities and to identify coexisting lesions⁶

Gastroesophageal reflux disease (GERD)

GERD is commonly associated with laryngomalacia, with some studies suggesting that nearly all infants with moderate to severe laryngomalacia have some degree of reflux^[5][7][9]. Refluxed gastric contents can inflame the laryngeal mucosa, exacerbating airway collapse and stridor.  

Neurological and genetic associations

Laryngomalacia has been linked to underlying neurological disorders, such as cerebral palsy or hypotonia syndromes, which may contribute to poor laryngeal tone and delayed maturation^[8][10].  

Diagnostic approach in the context of multiple airway lesions

Given the high rate of synchronous airway lesions, a thorough airway evaluation is recommended in infants with severe laryngomalacia, atypical symptoms, or failure to improve with standard management.^6,10

• Flexible laryngoscopy to assess supraglottic structures
• Bronchoscopy to evaluate the trachea and bronchi for malacia or stenosis

Conclusion

Laryngomalacia is a common cause of noisy breathing in infants, resulting from the dynamic collapse of supraglottic laryngeal tissues during inspiration. While most cases resolve spontaneously, laryngomalacia may coexist with other airway anomalies such as tracheomalacia, bronchomalacia, subglottic stenosis, and vocal cord paralysis, as well as systemic conditions like GERD and neurological disorders.^8,10

Recognition of these associations is critical for accurate diagnosis, risk stratification, and management. A comprehensive, multidisciplinary approach ensures the timely identification and treatment of coexisting airway conditions, improving outcomes for affected infants.

FAQs

What is laryngomalacia?

Laryngomalacia is a condition where the soft tissues of the larynx (voice box) are floppy, causing partial airway obstruction.

What are the symptoms of laryngomalacia?

Symptoms include noisy breathing, difficulty breathing, and feeding problems.

Is laryngomalacia related to other airway conditions?

 Yes, it can be associated with conditions like gastroesophageal reflux disease (GERD) and other airway obstructions.

 How is laryngomalacia diagnosed?

 Diagnosis is typically made through flexible laryngoscopy.

What are the treatment options for laryngomalacia?

Treatment ranges from conservative management to surgery, depending on severity.

Can laryngomalacia be managed without surgery?

Yes, many cases can be managed with monitoring, positional changes, and supportive care.

Summary

A condition where the soft tissues of the larynx (voice box) are floppy, causing partial airway obstruction.

• Common in infants, often presenting with noisy breathing, difficulty breathing, and feeding problems

Relationship with Other Airway Conditions:

• Associated with gastroesophageal reflux disease (GERD) and other airway obstructions
• It can lead to complications like breathing difficulties, feeding problems, and failure to thrive

Diagnosis and Treatment:

Diagnosed through flexible laryngoscopy.

Treatment ranges from conservative management (monitoring, positional changes, supportive care) to surgery for severe cases.

Key Points:

• Laryngomalacia can be managed without surgery in many cases
• Surgery is considered for severe cases with significant breathing difficulties or failure to thrive
• A multidisciplinary approach is often necessary for effective management