Why does my newborn grunt in their sleep?

Nobody warns you that a sleeping newborn sounds like a tiny farm animal. Grunts, squeaks, snuffles, the occasional dramatic sigh: most of it is completely normal, and this page explains where the noise comes from. But because a specific kind of grunting is a true breathing red flag, we will cover the warning signs first, clearly, so you know exactly what does and does not need action tonight.

First, the red flags: when grunting means get help now

Normal newborn grunting is occasional: a grunt here, a squirm there, easy quiet breathing in between. The warning sign is rhythmic grunting with every breath, a short grunt at the end of each exhale, which is how a baby in respiratory distress tries to keep air in the lungs. Seek urgent medical care, or call 911, if you see grunting with each breath or any of these alongside it:

Nasal flaring: nostrils widening with each breath.
Retractions: skin sucking in between or below the ribs, or at the base of the neck, with each breath, so the rib cage seems to cave inward.
Persistently fast breathing, much quicker than your baby's normal.
Color change: blue, gray, or unusually pale lips, skin, or nail beds. On darker skin, look for gray or whitish color at the lips, gums, and nail beds.
Breathing pauses longer than about 10 seconds, or a baby you cannot wake.
Fever: a rectal temperature of 100.4 F (38 C) or higher in a baby under 3 months is a call to the pediatrician right away, day or night, grunting or not.

None of those tonight? Good. Here is where all the normal noise comes from.

Reason 1: active sleep is loud

Newborns spend a huge share of their sleep in active sleep, the newborn version of REM: twitching, face-pulling, squirming, and yes, vocalizing. Grunts and squeaks during active sleep are your baby sleeping, not struggling, and babies frequently grunt, wiggle, and settle right back down without ever waking. Rushing in at every noise mostly teaches you to need less sleep.

Reason 2: tiny airways, nose breathing

Newborns breathe mainly through the nose, and those nasal passages are about the width of a drinking straw. A little mucus or dried milk makes every breath audible: snuffly, squeaky, grunty. This is also why babies sneeze constantly, which has its own page: why babies sneeze so much.

Reason 3: learning to poop is a whole project

A lot of nighttime grunting is your baby rehearsing digestion. Pooping requires tightening the belly while relaxing the pelvic floor, and newborns have not coordinated those two moves yet, so they grunt, strain, turn red, and sometimes cry before producing a completely normal soft stool. Doctors call it infant dyschezia; everyone else calls it grunting baby syndrome. It is harmless and usually resolves in the first few months. More on it in grunting and straining to poop.

Reason 4: periodic breathing

Newborns often breathe in a stop-and-go pattern: a pause of about 5 to 10 seconds, then a run of quick breaths, then back to normal. It is called periodic breathing, it is expected in the early months, and it usually disappears by around 6 months. It is also the reason so many parents have hovered over a bassinet at 2am waiting for the next breath. The line to hold onto: pauses under 10 seconds with good color and easy rousing are normal; longer pauses, color changes, or a hard-to-wake baby are not.

Bring the pattern, not the panic, to your pediatrician

If the noises still nag at you, data beats adjectives. Track sleep in YummyYucky and note the grunty stretches, and instead of "she grunts a lot??" you can show your pediatrician when it happens, how long it lasts, and how it lines up with feeds and poops. That is a two-minute conversation instead of a guessing game.

Frequently asked questions

Is it normal for my newborn to grunt in their sleep?

Usually, yes. Newborn sleep is loud: grunts, squeaks, sighs, and snuffles are standard issue, especially during active sleep, which makes up a large share of a newborn night. Narrow nasal passages, immature breathing rhythms, and practice runs at pooping all add grunting. The key distinction is occasional grunting during sleep versus a rhythmic grunt at the end of every single breath, which is a warning sign that needs urgent medical attention.

When should I worry about newborn grunting?

Seek urgent care if grunting comes with every breath, if the nostrils flare, if the skin sucks in between or under the ribs or at the base of the neck with each breath (retractions), if breathing is persistently fast, if lips or skin look blue, gray, or unusually pale, if a breathing pause lasts more than about 10 seconds, or if your baby is hard to wake. A rectal temperature of 100.4 F (38 C) or higher in a baby under 3 months is itself a reason to call the doctor right away.

Why does my newborn grunt and strain like they are trying to poop?

Because they often are. Learning to poop takes coordination: a baby has to tighten the belly and relax the pelvic floor at the same time, and newborns have not sorted that out yet. The result, called infant dyschezia or grunting baby syndrome, is grunting, straining, and even crying for a while before a perfectly normal soft stool arrives. It is harmless and typically resolves within the first few months as coordination clicks.

What is periodic breathing in newborns?

A normal newborn pattern where breathing pauses for about 5 to 10 seconds, then resumes with a burst of quicker breaths. It sounds alarming at 2am and is usually harmless, fading out over roughly the first 6 months. Pauses longer than about 10 seconds, color changes, or a baby who is hard to rouse are a different matter and need urgent evaluation.

Should I go to the ER for grunting?

Go now, or call 911, if grunting accompanies every breath or you see flaring nostrils, retractions, blue or gray color, or long breathing pauses; these are signs a baby is working too hard to breathe. Occasional grunts from an otherwise comfortable, well-colored baby who is feeding well and breathing easily between noises are the normal newborn soundtrack; mention them at your next visit if they bother you.

Will my baby outgrow the grunting?

Almost always. The pooping-practice grunts usually resolve within 2 to 3 months as muscle coordination matures, and periodic breathing settles into a regular rhythm over roughly the first 6 months. Meanwhile the standard-issue sleep grunts fade as sleep matures. If the nightly concert bothers you and everything else is normal, moving the bassinet a foot farther from your head is legitimate sleep hygiene, for you.

Sources

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Last updated September 2026. Next review December 2026. How we write these: built from current published guidance from the AAP, CDC, FDA/EPA, NIAID, WHO, and other pediatric and public-health authorities, with sources cited on the page. See our editorial and medical policy for how we research, source, and update these, and how we double-check the food advice.

This is general information, not medical advice, and is not individualized for your baby. Always talk to your pediatrician about your baby's diet, introducing allergens, and any reaction. In an emergency, contact emergency services.

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