Laryngomalacia is a condition where the soft cartilage around a baby’s voice box (larynx) collapses inward during breathing, causing a high-pitched, squeaky sound called stridor. It is the most common cause of noisy breathing in newborns, accounting for 45 to 75% of all cases of congenital stridor. Most babies with laryngomalacia have a mild form that resolves on its own as the cartilage firms up with growth, but a small percentage need treatment for breathing or feeding problems.
What Happens in the Airway
In a newborn’s throat, the structures around the voice box are made of cartilage that hasn’t fully stiffened yet. In babies with laryngomalacia, these tissues are especially soft and floppy. Every time the baby breathes in, the suction of air pulls the soft tissue inward, partially blocking the airway for a moment. That brief, repeated collapse is what produces the characteristic squeaky or fluttering sound.
There are three recognized patterns, classified by which part of the tissue is collapsing. In the most common type, the soft tissue sitting on top of the small cartilages at the back of the voice box (the arytenoids) flops into the airway. In the second type, the folds connecting the arytenoids to the epiglottis are abnormally short, pulling the structures together. In the third type, the epiglottis itself curls backward toward the airway. Many babies have more than one of these patterns at the same time.
What It Sounds and Looks Like
The hallmark symptom is inspiratory stridor: a high-pitched, vibratory noise that happens when the baby breathes in. It’s often described as sounding like a squeaky toy or a soft whistle. Parents typically notice it within the first two weeks of life, and it tends to get louder over the first several months before gradually improving.
The sound is usually worse in specific situations. Lying on the back makes it louder because gravity pulls the floppy tissue further into the airway. Feeding often intensifies it, since babies have to coordinate sucking, swallowing, and breathing all at once, and the extra effort increases the suction on those soft tissues. Crying, excitement, or an upper respiratory infection can also make the stridor more noticeable.
In mild cases, the noisy breathing is the only symptom. The baby feeds well, gains weight normally, and is otherwise comfortable. In more significant cases, you may notice the skin pulling inward at the neck or chest with each breath (called retractions), difficulty feeding, frequent choking or coughing during feeds, spitting up, poor weight gain, or brief pauses in breathing.
The Connection to Reflux
Acid reflux is strikingly common in babies with laryngomalacia. A systematic review of 27 studies covering nearly 1,300 affected infants found that about 59% also had reflux. The relationship likely runs in both directions. The extra effort a baby uses to breathe against a partially blocked airway creates pressure changes in the chest that can push stomach contents upward. At the same time, acid reaching the tissue around the voice box causes swelling, which makes the floppy tissue even bulkier and worsens the obstruction.
Reflux is especially common in babies with severe laryngomalacia. Studies found that infants with severe symptoms were nearly ten times more likely to have significant reflux than those with mild cases. When reflux is contributing to the problem, treating it with medication or thickened feeds can sometimes improve the breathing symptoms as well.
How It’s Diagnosed
Flexible fiberoptic laryngoscopy is the standard diagnostic tool. It involves passing a thin, flexible camera through the baby’s nose while the baby is awake. The doctor watches the voice box structures in real time as the baby breathes, looking for the characteristic inward collapse of tissue. The procedure takes only a few minutes and doesn’t require sedation, though some centers do perform it under light anesthesia. The awake exam is generally preferred because it shows how the airway behaves during normal breathing.
During the exam, clinicians score the degree of collapse. A scoring system ranging from 0 to 8 is used, with a threshold of 2 or higher pointing toward laryngomalacia. The exam also helps rule out other causes of noisy breathing, since several different airway conditions can sound similar.
Typical Timeline and Outlook
Most babies follow a predictable pattern. Symptoms appear in the first couple of weeks after birth and gradually worsen, typically peaking somewhere between four and eight months of age. After that peak, the cartilage begins to stiffen as the baby grows, and the noisy breathing slowly fades. For the majority of infants, symptoms resolve completely by 12 to 18 months, though some children continue to have noisy breathing during illness or exertion into toddlerhood.
Roughly 90% of cases are mild and require no treatment beyond monitoring. The remaining 10% fall into moderate or severe categories, where feeding problems, poor growth, or breathing difficulties warrant intervention.
Managing Mild Symptoms at Home
For babies with mild laryngomalacia, positioning makes a real difference. Babies with this condition tend to breathe more easily when lying on their sides or stomachs, sitting upright, or reclining at about a 30-degree angle. During feeding, holding the baby in an upright position helps reduce both the airway collapse and the reflux that often accompanies it. After feeding, keeping the baby upright for at least 30 minutes and never feeding while the baby is lying flat can minimize choking and spitting up.
If reflux is significant, a doctor may recommend thickening feeds or prescribing medication to reduce stomach acid. Periodic check-ups to track weight gain and monitor symptoms are the main medical involvement for mild cases.
When Surgery Is Needed
Supraglottoplasty is the first-line surgical treatment for severe laryngomalacia. It involves trimming or reshaping the floppy tissue that’s collapsing into the airway, and it’s performed through the mouth under general anesthesia with no external incisions.
The most common reasons for surgery, based on a survey of practice patterns, are worsening airway symptoms or life-threatening breathing episodes (43% of cases), failure to thrive from poor feeding and inadequate calorie intake (41%), and worsening feeding difficulties like persistent choking (10%). Additional red flags that may push toward surgery include a bluish discoloration of the skin during breathing episodes, a chest wall that’s beginning to develop a sunken shape from chronic increased breathing effort, low oxygen levels, and in rare severe cases, strain on the heart from prolonged airway obstruction.
Feeding Challenges and Growth
Feeding problems are the second most common issue after noisy breathing. The same floppy tissue that causes airway collapse also makes it harder for babies to coordinate sucking, swallowing, and breathing, the three actions that need to happen in rapid sequence during every feed. Babies may choke, cough, pull away from the breast or bottle frequently, or take unusually long to finish a feed. The extra energy spent on labored breathing also burns more calories, making weight gain harder even when the baby seems to eat a reasonable amount.
Gastric distension and the pressure changes from breathing against a partially blocked airway can trigger regurgitation and vomiting during or right after feeds. Over time, if calorie intake consistently falls short, a baby may begin dropping on growth charts. Failure to thrive in this context is defined using World Health Organization growth charts, where a weight-for-length score falling below negative 2 signals moderate growth delay, and below negative 3 indicates severe delay. Babies in these ranges are typically candidates for surgical intervention rather than continued watchful waiting.
Signs That Need Prompt Attention
While most babies with laryngomalacia do well, certain signs suggest the condition is more than mild. Visible retractions, where the skin sucks inward at the neck, between the ribs, or below the breastbone with each breath, indicate the baby is working significantly harder to move air. Cyanosis, a bluish tint around the lips or face, means oxygen levels are dropping. Apnea, where the baby has noticeable pauses in breathing, is another serious indicator. Persistent difficulty feeding with choking episodes at every feed, or weight loss instead of gain, also warrants evaluation rather than a wait-and-see approach.