Why are babies so noisy when they sleep? If you have found yourself tiptoeing back to the bassinet at 2 am to check on a grunting, squeaking, or snoring baby who turns out to be completely fine, you have experienced one of new parenthood’s great surprises. 

Contrary to the popular belief, “sleeping like a baby” in reality your baby often sounds like a small farm animal learning to breathe.

A noisy baby while sleeping is, in the vast majority of cases, entirely normal. But that does not make it any less alarming when you are not sure whether that sound is just digestion or something that needs attention. 

Today, with a little help from our expert, Nicole Cannon, a Certified Infant and Child Sleep Consultant and Founder of The Sleepy Mama, we’ve answered all your questions about baby sleep noises. What they mean, why they occur, and when to take action. Read on to learn more about it.

Why are babies so noisy when they sleep?

The short answer is that their bodies are doing enormous developmental work every time they close their eyes, and most of it is audible.

Babies spend half their sleep in active REM

According to the National Library of Medicine, newborns spend approximately 50% of their total sleep time in active REM sleep, compared to just 20 to 25% in adults. 

During the REM sleep stages, adult muscles are essentially paralysed, which is why adults sleep quietly. In babies, that muscle paralysis has not yet developed, meaning they move, grunt, twitch, and vocalise freely, all while remaining fully asleep.

Newborn sleep cycles last approximately 45 to 50 minutes, with roughly half of each cycle spent in active, audible REM sleep. With 14-17 hours of sleep per day, that adds up to a significant amount of noisy, restless sleep for your baby.

Babies have extremely narrow airways

Babies are obligate nose-breathers for the first few months of life. Even a small amount of mucus creates audible wheezing, snuffling, or whistling that would be completely silent in an older child.

Babies’ digestive system is still maturing

Your newborn is eating every two to three hours and processing every feed with an immature gut. Gas, hiccups, burping, and bowel movement sounds continue during sleep because their digestion does not pause for rest. 

The grunting sounds associated with straining to pass a stool, known clinically as infant dyschezia, are especially common in the first few weeks and entirely normal.

The breathing rate of babies is naturally faster and more irregular

Your newborn breathes at 40 to 60 breaths per minute, roughly three to four times the adult resting rate. 

This faster rate, combined with periodic breathing, where breathing briefly speeds up, slows, or pauses for up to 10 seconds before resuming, is a normal feature of the newborn nervous system.

Baby sleep sounds: A complete reference guide

Use this table to quickly identify what you are hearing, what is likely causing it, and whether it needs any action. 

Sound type	Likely cause	Normal or concern?	Action needed
Grunting	Digestion, active sleep	Usually normal	Monitor
Squeaking	Small airways/nasal sounds	Normal	None
Snorting	Congestion or mucus	Usually normal	Saline drops/humidifier
Whimpering	Active sleep transitions	Normal	Wait before intervening
Soft snoring	Mild congestion	Sometimes normal	Monitor
Wheezing	Lower airway issue	Concerning	Call pediatrician
Stridor	Narrowed airway	Potential concern	Medical evaluation
Pauses under 10 sec	Immature breathing	Usually normal	Observe
Blue lips + noisy breathing	Breathing difficulty	Emergency	Seek urgent care

Sources: AAP (HealthyChildren.org), Sleep Foundation, Children’s Minnesota.

Cradlewise Note: This is designed to be your 3am reference, not a substitute for your paediatrician’s advice if you are genuinely worried.

Sounds babies make by age: Newborns, 3-week-olds, and 6-week-olds

The sounds your baby makes change as they develop. Here is what is normal at each early stage, and what tends to improve when.

Newborn to 2 weeks: The loudest phase

This is peak noise. Breathing is at its most irregular, the digestive system is brand new, and sleep cycles are short, frequent, and heavily weighted toward active REM. 

However, as long as your baby is feeding well, gaining weight, and has normal skin colour, the sounds are almost certainly within the normal range.

3-week-old baby noisy sleeper: Digestion peaks and grunting baby syndrome

At three weeks, many parents notice a spike in nighttime grunting and straining. This is typically the peak of infant dyschezia, as newborn babies have not yet learned to relax the pelvic floor while using abdominal pressure to pass a stool. The result is audible effort by your baby’s tiny body that can sound alarming but is developmentally expected.

What is normal at 3 weeks: Baby grunting with sleep transitions, audible digestion sounds, soft snuffling, and occasional snoring. 

What warrants a call: Noisy breathing that is getting progressively louder over days, grunting at the end of every breath, or any red flag listed in the section below.

6-week-old baby noisy sleeper: The start of quieter nights

Around 6 weeks, your baby’s sleep begins to feel slightly more organised. Circadian rhythms start maturing. The digestive system becomes more efficient. The intense grunting of the newborn phase begins to ease.

Your baby’s breathing becomes quieter and more regulated over this period. 

What is normal at 6 weeks: Soft grunting, occasional snuffling, sighing between sleep cycles.
What is improving: The frequency of digestive grunts, the irregularity of breathing.

Baby has noisy breathing while sleeping: Stertor, stridor, and baby grunting explained

The Sleep Foundation notes that noisy breathing in newborns is reported in approximately one third of infants under 6 months.

In other words, a loud-breathing baby is far more common than a quiet one. However, not all baby breathing sounds are the same. 

These three types have distinct causes and distinct levels of concern. Here is how to tell them apart.

Stertor

Stertor is a low-pitched, snoring or rattling sound caused by partial obstruction of the upper airway at the level of the nose, throat, or back of the mouth. In babies, the most common cause of stertor is nasal congestion or mucus.

Stertor tends to sound like a soft snore or a wet rattling sound when your baby breathes. 

Mild, intermittent stertor is common and usually benign. However, if the snoring or rattling is loud, present every night, and your baby appears to be working to breathe, discuss it with your pediatrician. Persistent loud stertor can occasionally indicate obstructive sleep apnoea in infants.

Stridor

Stridor is a high-pitched, harsh squeaking sound heard when a baby inhales. It occurs when something is partially blocking the upper airway. 

According to HealthyChildren.org (AAP), stridor is most common in babies because their airways are narrower, and it is usually described as a repetitive or high-pitched squeaking sound.

The most common cause of stridor in babies is laryngomalacia, a condition where the soft cartilage of the larynx partially collapses inward on inhalation. 

Visit a pediatrician immediately, if stridor in your baby is consistent, worsening, accompanied by feeding difficulties, poor weight gain, change in skin color, or laboured breathing.

Grunting

Occasional grunting during sleep is almost always normal. The most common cause is infant dyschezia, the normal process of a baby learning to use abdominal muscles to pass a stool. Grunting also occurs during sleep transitions, mild gas discomfort, and active REM sleep.

Occasional sleep grunting is normal. However, if you notice that your baby is grunting at the end of every single breath, it might be a sign of respiratory distress and requires immediate medical evaluation.

When should you worry about your baby’s noisy sleep?

According to Nicole Cannon, the following signs can signal a bigger issue and warrant immediate attention.

Call your pediatrician promptly for:

• Grunting at the end of every breath (expiratory grunting), rather than just occasionally during sleep.
• Stridor (high-pitched squeaking on inhale) that is persistent, worsening, or accompanied by feeding difficulties.
• Loud snoring that is present every night and disturbs your baby’s sleep.
• Breathing that sounds consistently wet or crackly.
• Noisy breathing accompanied by fever, poor weight gain, refusing feeds, or unusual fatigue.

Seek emergency care immediately for:

Apart from the points listed above, there are other physical indicators that your little one needs immediate medical attention, such as:

• Bluish or greyish tinge to the lips, skin, or fingernails (cyanosis).
• Chest retractions where pulling inwards of the chest under the ribs, or above the collarbones is visible. 
• The nostrils visibly widening with each breath, another sign of laboured breathing.
• Breathing rate above 60 breaths per minute.
• Long pauses between breaths (lasting more than 10 seconds).
• Lethargy or extreme difficulty waking.
• Gasping or choking sounds.

Nicole Cannon adds, “If you ever feel like something is wrong, trust your instinct. Sometimes those weird noises can signal a bigger issue (especially with things like reflux), so it’s helpful to always consult a doctor if you feel like the noises are too frequent or you notice that they don’t sound typical to you.”

When do babies stop being such loud sleepers?

“Usually the sounds start to decrease after the first few months (especially the digestive ones). Some babies with reflux or digestive issues may continue to struggle longer than that, but with the increased airway space and matured digestive tract, most sounds are minimal by the time a baby gets to the 6-month mark,” says Nicole Cannon.

The timeline varies by baby, but here is what the evidence shows.

Baby’s Age	What Changes in Sleep Sounds	What Parents Usually Notice
By 6 to 12 weeks	Grunting and straining linked to infant dyschezia usually improve as the digestive system matures and breathing muscles become stronger.	Less grunting, fewer strained noises during sleep, and smoother breathing patterns.
By 3 to 6 months	Babies spend less time in active REM sleep, which is the lighter, noisier stage of sleep.	Fewer squeaks, twitches, sudden noises, and restless sleep movements at night.
By 6 months	Airway space grows, the digestive tract matures further, and sleep cycles become longer and more stable.	Most sleep sounds become minimal, with fewer wake-ups and quieter overall sleep.

If the sounds continue at the same intensity over the past 6 months, or if they are accompanied by any of the red flags above, it is worth a discussion with your pediatrician.

Practical tips for parents of loud sleepers

While you cannot silence your baby’s normal sleep sounds, there are a few things that can help both of you get more rest:

• Burp thoroughly after every feed. Trapped gas is a major contributor to nighttime grunting. Try holding your baby upright for 15 to 20 minutes after feeding before laying them down.
• Use saline nasal drops for congestion. If the sounds are coming from a stuffy nose, a small amount of saline solution can clear nasal passages and reduce the wheezing and snuffling sounds.
• Try white noise. White noise benefits both your baby and you. It can help mask the sounds of light sleep transitions for your baby and, importantly, it can buffer the sound for you so every small squeak does not jolt you awake.
• Consider room-sharing rather than bed-sharing. The AAP recommends room-sharing for at least the first 6 months as a protective factor against SIDS. Having your baby close means you can monitor breathing sounds without bringing them into your bed.
• Avoid reacting to every sound. One of the most common newborn sleep mistakes is responding to every sound, which can disrupt your baby who is simply in active sleep and not actually waking. Wait a moment before going to them.

Cradlewise tip: The Cradlewise Smart Crib includes a built-in monitor that tracks your baby’s breathing movements and sleep patterns in real time. Rather than jumping up at every sound, you can check your baby’s status without entering the room, which protects their sleep and yours. Its responsive soothing also means that when your baby is genuinely transitioning toward waking, they get gentle support before they fully rouse.

Conclusion

Your baby is a noisy sleeper, and you have discovered the reasons behind it. Babies breathe differently, sleep differently, and transition between sleep cycles much more actively than adults. Their tiny airways, immature digestion, and active REM sleep all contribute to the sounds you hear overnight.

Still, some breathing sounds should not be ignored. If your baby shows signs of breathing difficulty, blue lips, chest retractions, or persistent high-pitched breathing, contact your pediatrician promptly.

Over time, most babies naturally become quieter sleepers as their breathing, digestion, and nervous system mature.

You may also like:

• When do babies roll over? Signs and safety tips.
• Baby’s first smile: When do babies start smiling at you?
• When do babies start sitting up? Signs your little one is getting ready.

Sources:

1. Babies spend half their sleep in active REM. National Library of Medicine. 2022. Sleep Studies for Clinical Indications during the First Year of Life: Infants Are Not Small Children. 
2. Newborn sleep cycles last approximately 45 to 50 minutes. National Library of Medicine. 2013. Promoting and Protecting Infant Sleep.
3. Your newborn breathes at 40 to 60 breaths per minute. Medical News Today. 2026. What to know about newborn respiratory rates.
4. During active REM sleep, your baby can laugh, suck, cry out, and even smile. Did you know?Sleep Foundation. 2025. Why Do Babies Smile in Their Sleep?
5. Baby noisy breathing while sleeping. Sleep Foundation. 2025. Newborn Snoring.
6. Stridor. HealthyChildren AAP. 2026. Stridor & Laryngomalacia: Is My Baby’s Noisy Breathing Serious?
7. Room sharing rather than bed sharing. HealthyChildren AAP. 2026. How to Keep Your Sleeping Baby Safe: AAP Policy Explained.