Teething Doesn’t Cause Fevers — and Other Myths To Sink Your Teeth Into

Drooling, chewing and mild fussing are the most common baby teething symptoms
Teething baby crying

Getting a new tooth is one of those telltale signs that your little baby is growing up so fast. So, it’s natural to look forward to that tooth erupting with excitement — and maybe a bit of nervousness and a bunch of questions about what to expect:

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  • Will it hurt?  
  • Will it mean even more restless nights?
  • Can teething cause fevers?

When it comes to baby teething symptoms, there’s a lot of conflicting information out there. Some people say teething is excruciating. That it’ll keep your baby from sleeping. That teething can be blamed for a fever, diaper rash and just about any other ailment. 

All myths, says pediatrician Lisa Diard, MD

Teething can cause some mild discomfort and fussiness, but anything more than that should be evaluated as a more serious concern,” she says.  

Here, Dr. Diard breaks separates teething fact from fiction. 

Symptoms of teething babies 

Most babies get their first tooth sometime around 6 months old, but it could be as early as 4 months or as late as 15 months. (Fun fact: It’s rare, but some babies are even born with a tooth or two!) Most toddlers will have a full mouth of 20 baby teeth by the time they’re about two and a half. 

The American Academy of Pediatrics says kids who are teething “are little different from kids who are not teething.” In other words, teething shouldn’t be a major upset in your baby’s day (or yours). 

“Teething can cause mild gum pain for babies, but it shouldn’t be anything that severely derails their regular mood or schedule,” Dr. Diard states.   

Some babies won’t show any signs a new tooth is about to poke through. Others may: 

  • Be a bit more irritable: Fussy, cranky, whiny — whatever you call it, they’re simply not themselves. And they might be a little clingier than usual. 
  • Have excessive drool: Pack extra bibs! 
  • Be extra mouthy: Watch out for your fingers because a baby getting new teeth is more prone to gnawing, chewing and even biting whatever they can get in their mouth. 

Teething symptoms tend to peak as the tooth works toward making its debut, but will taper off when the tooth becomes visible. That should take about three or four days. 

Common teething myths 

Any parent with a little one in that teething window knows it’s easy to blame teething for just about everything:

  • Bad night’s rest? Must be teething. 
  • Loose stool?  Ugh … teething. 
  • Fever? Those darn teeth again. 
  • Cranky baby? Teeeeeeeth. 

But research says otherwise

It’s a correlation versus causation thing. In other words, sure, babies get fevers and diaper rash and have bad nights here and there. That’s all part of being a baby.

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Sometimes, those things happen to come up around the time they’re getting new chompers. But that doesn’t mean that teething is causing those symptoms. They’ll be getting new teeth regularly for a pretty solid two years, after all. They’re bound to have a bad day at some point during that time. It doesn’t mean they’re acting differently because of teething. 

Dr. Diard walks us through a few of the symptoms that people tend to brush off as a part of teething but are actually unrelated. 

Myth: Teething causes fevers 

Probably one of the best-known myths around says that teething babies will spike a fever. Not only is that not true, Dr. Diard says, but it can also be a dangerous misconception. 

“If your baby has a fever, you don’t want to ignore it and think it’s something it’s not,” she continues. “Teething doesn’t cause a fever. If your baby has a fever, something else is going on.” 

But here’s the thing, you may be thinking of a fever in different terms than a healthcare provider does. 

Some parents tend to think their child is showing a fever if their temperature is anything above their normal range — generally around 98.6 degrees Fahrenheit (37 degrees Celsius). But healthcare providers define a fever as anything higher than 100.4 F (38 C). 

Teething may cause your child to have a body temperature that’s higher than normal, but still below the threshold for a fever. 

TemperatureDefinitionIs their temperature related to teething?What to do?
About 97.7 to 98.6 F (36.5 to 37 C)Normal, healthy range.Could be. Nothing.
About 98.7 F to 100.3 F (37 C to 37.94 C)Elevated temperature.Could be. Monitor at home.
100.4 F to 103.9 F (38 C to 39.94 C)Fever.No.Baby younger than 3 months: Contact your provider.
Baby older than 3 months: Treat at home and call a provider if it doesn’t improve in about three days.
104 F or higher (40+ C)High fever.No.Seek emergency medical advice.

Fevers are our immune system’s way of taking care of business — fighting off an infection. And not all fevers are a reason to worry

But Dr. Diard says you should talk with your children’s healthcare provider if:  

  • Your baby is fewer than 3 months old and showing a fever above 100.4 F (38 C). 
  • Your older baby has a fever above 104 F (40 C). 
  • The fever remains for more than three days or doesn’t come down with the use of fever-reducing medication like Tylenol® (acetaminophen).  
  • Your child is difficult to arouse. 
  • Your child isn’t drinking enough or is showing signs of dehydration, like urinating infrequently. 

Myth: Teething causes diaper rash 

Another teething myth that’s been passed through the ages is that teething leads to diaper rash.  

Not true, Dr. Diard says. 

The old tale goes that teething creates more drool. That part’s true. The myth comes next.  

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Some people will tell you that when your baby swallows that extra saliva, it mixes up in their bellies and creates loose stool (aka everyone’s least-favorite diaper change.) And — as you probably know all too well — runny poop can be a diaper rash waiting to happen. 

But the theory hasn’t proven out in research. So, if your baby has a diaper rash, you’ll want to consider a cause other than teething. 

Common causes of baby diaper rash include: 

  • Irritation from diapers or wipes. For babies who use cloth diapers, certain laundry detergents can be irritating, too. 
  • Heat rash from being dressed too warmly. 
  • Food sensitivity

To avoid diaper rash, change your baby’s bottom as soon as possible when it’s wet or soiled. If it’s too late, stick to soap and water instead of baby wipes, and try an ointment with zinc oxide to manage diaper rash

Myth: Teething babies don’t sleep well 

All babies are different. Some snooze away in their crib with little fuss. Others want to party all night long. And just when you think you got it all figured out … BAM! … sleep regression

Just as with any other aspect of their lives, babies go through a lot of phases when it comes to sleep, but teething doesn’t play a role in their sleep habits. 

“Some parents worry that teething is causing their baby too much pain for them to sleep well,” Dr. Diard says. “But the discomfort of teething is pretty mild. It doesn’t affect sleep.” 

Help your baby get enough sleep they need by: 

Teething can sound like this big, scary change in your baby’s life. And no one wants to think their baby is in pain or discomfort. But knowing that not every fuss, whine or fever is part of teething can bring some peace of mind.  

In truth, teething shouldn’t be that hard on your baby. If your baby is showing symptoms like fever, diaper rash or sleeplessness, look for other solutions. And don’t hesitate to talk with your children’s healthcare provider. They can help you find solutions, rather than placing the blame on your child’s teeth.  

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