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Why My Baby Sleeps With Mouth Open And What To Do About It

Why My Baby Sleeps With Mouth Open And What To Do About It

It’s not uncommon to find your kids resting in bed in cute little poses. One of the most comical ones is when your baby sleeps with mouth open.

But as funny as it may be at the time, mouth breathing is something that may grow into a large nuisance later on in life and is best attended to early.

You see, when your baby sleeps with mouth open, she is susceptible to a number of various problems, ranging from something as simple as dry mouth and bad breath, all the way to ADHD in some cases.

If left unattended for too long, it might become a habit that’s going to be quite hard to shake.

Luckily, the causes of mouth breathing aren’t too difficult to deal with and most of them can be solved through some mild lifestyle changes and a bit of attention from the parent’s side.


The best thing to do is to take it from the top – the actual causes of mouth breathing and how they affect your little one’s sleep and other aspects of life.

1. Mucus forming in the nose due to an illness

Mucus forming in the nose due to an illnessThis is the most common cause of mouth breathing in kids during early stages of development, given how easy it is for your child to contract a cold or to have a potential light allergy that hasn’t been explored fully yet.

We all know how big of a pain clearing a stuffy nose can be even if you’re capable of using handkerchiefs.

While babies aren’t that developed yet, luckily there are various ways you can solve their problem for them.

The cause of a stubbornly stuffy nose can also come from dehydration.

Your newborn baby might not be getting enough feedings, which allows the mucus to dry up inside the nose, making it a pain to get rid of.

2. A deviated septum

A deviated septumIt’s actually quite common in people worldwide since nobody is born perfect, but the severity of it depends on if it’s going to cause any difficulties with nasal breathing or not.

A deviated septum is what would be called “a crooked nose” in simpler terms.

It’s a condition one is either born with, or it’s inherited after suffering some sort of nasal trauma.

It also forms more frequently in babies due to the softness of the cartilage that splits the nose into two nasal pathways down the middle.

It’s not that hard to notice either. It’s quite easy to spot when your child’s nose is off-center. The problem comes in when it’s time to look toward fixing it.

Messing around with any bone/cartilage structure at an early age is only going to invite further complications down the line and, as such, is not recommended until the child is at least 15 years of age.

Until then, she’ll have to live with a deviated septum.

While not the absolute worst thing in the world, it can be quite a nuisance with symptoms including, but not being limited to, having trouble breathing, loud snoring at night, postnasal drip, nosebleeds, and, in more serious cases, sleep apnea.

I myself have had a deviated septum ever since an incident with a dog accidentally smacking my face with his paw a bit too hard that it knocked both my nose and a few of my lower teeth out of whack when I was around 4 years of age.

My teeth were fixed with braces and a removal of one of them that was too far back, and the septum was solved once I could pay for the septoplasty myself since it didn’t cause me too many issues.

The only actual problem was having to inhale twice as hard since one of my nostrils was always plugged while the other had twice the contact surface that needed that extra suction.

3. Sleep Apnea

Sleep ApneaSleep apnea, or rather the type that relates to our issue here, obstructive sleep apnea, is a condition in which the muscles in the back of one’s throat relax, leading to a narrowed airway, which causes a lack of airflow.

The obstructions of the nasal airflow are usually tonsils and/or adenoids, hence why enlarged tonsils can pose a great number of issues in early childhood and why many children end up getting them surgically removed altogether.

This makes the person either breathe through their mouth or wake up briefly many times throughout the night to catch a small breath of air, leading to a number of issues.

The main ones being hypersomnia (lack of energy during the day), increased irritability, and complications in the later stages in life, like increased risks of heart disease or diabetes – plus sleep deprivation for the affected person and the people in their household in general, which comes as a given.

4. A force of habit

black and white photo of baby sleeping with open mouth on dad's shoulderAs mentioned earlier, sometimes there’s nothing wrong with your child and she might have just developed a habit of sleeping with an open mouth due to one of the prior causes or some sort of cold or other illness that may have struck her.

This can be the toughest to get rid of, since there’s no inherent factor that you can remove as easily as you could with all the other cases.

It might become easier when they become older and can understand basic communication, but it’ll still pose a great challenge.


1. Get a humidifier

humidifier and babies handHumidifiers do wonders when you need to clear nasal passages, helping humidify the air in the room so everyone in it can have a more pleasant rest with less chance of irritation or dried out nostrils, which might lead to nosebleeds.

You can even find one that doubles as a diffuser so you can slip some essential oils in for extra benefits, depending on what your child (or you) might be struggling with.

My personal suggestion is to get one that sprays cool bouts of mist to always feel refreshed, but that’s just personal preference.

RELATED: 14 Best Humidifiers For Babies For The Sweetest Dreams

2. Run a hot shower

Run a hot showerThe alternative to getting a humidifier can just be to make your shower into a pretend-sauna for a little while.

Let the shower run hot water so the steam can rise and clear your baby’s stuffy nose and help them breathe through their nostrils again.

It will be cheaper in the long run, but it does require you to always make trips to the bathroom if you want to maintain the constant effect that a humidifier would.

3. Mix saline solution and put it in a nasal sprayer bottle

nasal sprayer bottleWhile some of the more potent nasal sprays might be a bit too much for your little one’s nose to handle, you can always rely on saline solution to do the trick.

While normally it can be purchased in drug stores just as easily, if you don’t have one nearby, you can just as easily make some yourself.

Just get a cup of pre-boiled or distilled water (you don’t want any bacteria lingering in the water) and mix in half a teaspoon of salt.

Once it’s brought down to room temperature, place it in a sprayer bottle with a small nozzle that you’ve fully cleaned of their old contents, then spray it gently into your baby’s nostril.

That ought to clear those upper airways right up and get your precious child breathing through her nose again.

4. Make sure to keep your baby hydrated

baby sitting in chair and drinking from baby cupWhether it’s giving her more feedings in a day or relying on baby formula/water if you can’t, just make sure your baby is properly hydrated to keep her nasal pathways humid.

This will help to dissolve the dried snot and mucus right up and help it flow out.

5. Use a bulb syringe / nasal aspirator

baby laughing while getting a nasal aspiratorA nice and clean bulb syringe/baby nasal aspirator will almost always do the trick, but you have to be careful about it.

This is still your precious little child’s nose we’re talking about and you doesn’t want to hurt her in the process.

Carefully slide the end of the syringe in, position it properly and then slowly release the bulb pressure so it can suck the mucus in and clear that blocked nose right up.

Don’t forget to wash and disinfect it after each use.

You don’t want it getting crusted up or getting some nasty bacteria on it when you intend to use it at a later date.

6. Consult your pediatrician, family doctor, or ENT specialist

Pediatrician consulting mother with a babyA lot of these issues that lead to your baby becoming a mouth breather can have similar symptoms.

If your baby sleeps with mouth open despite trying all of these other solutions, it’s best to make an appointment with your local pediatrician.

Have them check your child for any nasal irregularities so they can pinpoint the problem affecting your little one.

They should be able to provide you with the best steps to take once the problem has been identified in case it’s some sort of nasal infection, an allergen-induced nasal blockage, or part of a different underlying problem.

The Consequences Of Mouth Breathing

1. Breathing problems

baby cry in bedThis is the most obvious consequence, seeing as most of this article speaks of it.

Breathing through the mouth doesn’t actually let people get as much air to the lungs as breathing through the nose does, leading to a lack of oxygen in one’s blood, which makes them get winded a lot easier and feel tired throughout the day in general.

2. More chances of infections

Baby Won't Stop Crying: 10 Tips To Calm Down Your Little OneNasal breathing doesn’t just benefit your oxygen enrichment, but it’s also a much better filter for bacteria and other nasties than breathing through the mouth ever will be.

This is due to the much narrower passage filled with tiny nose hairs and said mucus that help catch most of the nasty air particles and prevent them from entering one’s respiratory system. Sadly, the mouth doesn’t have that filter.

3. Dry mouth

Mother holding a crying babyWhile not the most hazardous issue, it can be quite annoying to wake up with a dry mouth because you’re stuck drooling, or lose your saliva levels because of the air circulation.

Keeping a bottle of water nearby can help alleviate the issue when your baby wakes up, but is not a permanent solution, especially since it leads to a slightly worse issue.

4. More cavity-prone

Purple Crying: What Is It And How To Help Your Little OneWhen you see your baby sleeping with mouth open, you might not realize it, but she’s inviting cavities in.

Yes, breathing through the mouth will lead to more bacteria lingering on the teeth. It has little to do with the actual breathing part, but more with the fact that your saliva levels are low and they can’t properly contain it.

This leads into a lot more of it retaining on the teeth, eating away at the protective coating and causing cavities.

Not only that, but due to the increased amount of bacteria in the mouth, her breath starts gaining a rather foul odor a lot quicker, even if she gets to teeth-brushing age.

This also means that your baby’s mouth is a lot more prone to gingivitis, which will only cause her unnecessary pain and discomfort and could potentially become periodontitis – something you’d rather not have your little one have.

Thankfully, the more serious issues can just be resolved with good dental hygiene once your child gets to that stage.

5. Long face syndrome

Long face syndromeAs odd as it may seem, long face syndrome or “open bite syndrome” is believed to be caused when baby sleeps with open mouth.

That’s because children aren’t comfortable sleeping on their backs but rather opt to sleep on their stomachs with their heads to the side. 

Due to the softness of their bones at an early stage, this sleeping position leads to a slightly less natural skull development – a more vertical one, to put it in simpler terms, also caused by the person’s lower jaw being lower than intended, making the face develop as more elongated to adapt.

While not inherently disruptive, it may come off as unappealing to some.

If it does become a bother, surgical procedures do exist that can correct the issue, but again, do not put your child under any facial reconstruction surgery until they’re at least 15 years of age.

How To Prevent Mouth Breathing From Becoming A Problem

How To Prevent Mouth Breathing From Becoming A ProblemThe most important key to solving any of these issues before they become something that might actually be a problem is to react early and quickly.

Pay attention to the way your little one breathes.

If your baby sleeps with mouth open and only breathes through her mouth, get that pediatrician’s appointment sorted to narrow the issue down and resolve it.

It won’t cost much apart from a bit of your attention (which you’re already devoting to your little one) and they’ll have a better life for it in the future.

This way you also get to prevent mouth breathing from becoming a nasty habit that’ll be hard to eliminate should it set in.

Thankfully, none of the issues that arise from your baby sleeping with mouth open are really fatal, outside of sleep apnea on very rare occasions, and no drastic surgery needs to be taken unless your child herself feels the need for it later.

So don’t stress too much about it if you miss a few of the cues, but remain vigilant regardless, mammas.

READ NEXT: Milk Coming Out Of Baby Nose – Why It Happens And What To Do

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Why My Baby Sleeps With Mouth Open

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