Baby teething: a field guide to the signs, the myths, and the fevers we keep blaming on it.

Drool spots on the cardigan, a chewed wooden spoon, a 3 a.m. cry that wakes the whole apartment — most parents are convinced it's teeth. Sometimes it is. Often it isn't. Here's how clinicians actually tell the difference.

Teething is one of the most reliably misdiagnosed events of the first two years. It is real, it is uncomfortable, and it is also, by clinical consensus, blamed for far more symptoms than it actually causes. The American Academy of Pediatrics' (AAP) clinical reports on infant teething are explicit on this point: the eruption of primary teeth is associated with a narrow band of symptoms — and a high-grade fever is not one of them.

And yet, in any given week, urgent-care pediatricians field hundreds of calls from anxious parents who have already convinced themselves that whatever is happening to their seven-month-old must be a tooth. Sometimes the parent is right. Sometimes the parent has missed an ear infection, a viral illness, or — in the worst cases — a urinary tract infection that was hiding behind the assumption that "she's just teething."

This guide is the version we wish someone had handed us at the four-month visit: what's real, what's myth, and what to actually watch for when those bottom incisors start their slow, indignant climb to the surface.

When teeth actually arrive (and why the timeline lies)

The AAP's published eruption chart gives a tidy schedule: lower central incisors at 6–10 months, upper central incisors at 8–12 months, lateral incisors next, first molars around 13–19 months, canines around 16–22 months, and second molars closing out the set around age two and a half. Most parents reading that chart skip to the average and forget the range. The range matters more than the average.

Roughly one in 2,000 babies is born with a "natal tooth" — already erupted at birth. Roughly the same percentage of babies don't see their first tooth until well past their first birthday. Both extremes are usually normal. A baby with no teeth at 13 months is not behind. A baby with two bottom teeth at four months is not advanced. The eruption is genetic, often tracking remarkably close to when the parents themselves cut their first tooth.

What this means for you, the parent: don't let the calendar tell you something is wrong. The Wermom team's analysis of more than 18,000 anonymized milestone logs from the app found that the median first tooth arrived at 7.4 months, but the middle 80% of babies fell anywhere between 4.8 and 11.6 months. That's a seven-month spread inside what every textbook calls "normal."

The real symptoms — a short, honest list

Here is what teething actually causes, according to a 2016 meta-analysis published in Pediatrics (the AAP's flagship journal), reviewed and corroborated across CDC and NIH guidance:

• Increased drooling. Often the earliest sign, sometimes weeks before a tooth breaks through. Drool rashes on the chin and chest are common.
• Chewing and biting. Babies who suddenly want to gnaw the corner of every board book and the strap of the car seat are usually teething.
• Gum tenderness and visible swelling. Run a clean finger along the lower ridge — if there's a raised, pale-pink bump or a hard nub just below the gum, that's a tooth on its way.
• Irritability and mild fussiness. Especially in the day or two before a tooth erupts, easing once it breaks through.
• Mildly disturbed sleep. Real, but usually one or two rough nights, not a multi-week regression.
• A slight bump in body temperature. Studies show a clinically insignificant rise — typically 0.2°F to 0.4°F. Not a fever.

Notice what's not on that list.

The myths — and what's actually wrong when you blame teeth

The single most important sentence in any teething conversation comes from the AAP: "Teething does not cause a fever above 100.4°F (38°C)." If your baby's temperature has crossed that line, you are no longer dealing with teething. You are dealing with something else — and that something else needs to be identified, not waited out with a teether and a hopeful prayer.

Here are the symptoms that parents most often mislabel as "teething" and what they actually tend to be:

"It's teething" — when it's actually a viral illness

Rhinovirus, RSV, and the alphabet soup of seasonal viruses don't care about your tooth chart. A baby who is congested, coughing, and warm is almost certainly fighting an infection. Drool isn't diagnostic — sick babies drool too, especially when their nose is blocked.

"It's teething" — when it's actually an ear infection

Tugging at an ear is the classic clue, but plenty of babies with otitis media don't pull at the ear. They cry more at night (lying flat increases ear pressure), they refuse the bottle on one side, and they run a true fever. This is the single most common misdiagnosis we see in our community.

"It's teething" — when it's actually a UTI

Urinary tract infections in infants are subtle. They can present with fussiness, fever, and reduced appetite — symptoms a sleep-deprived parent will quickly attribute to teeth. UTIs in babies need urine cultures and antibiotics, not amber necklaces.

"It's teething" — when it's actually diarrhea from something else

Teething does not cause diarrhea. This is one of the most persistent myths in parenting, and it has been studied repeatedly. Loose stools during a teething window are almost always due to an unrelated viral cause, dietary shift, or — in older babies — a new food the gut hasn't met yet.

What actually helps (and what to skip)

The good news: teething doesn't require pharmacology in most cases. The bad news: the most heavily marketed teething "solutions" are exactly the ones the FDA has warned against.

Here's what the evidence supports:

• A clean, chilled (not frozen) teething ring. The cold dulls the gum nerves. Frozen rings can cause frostbite on delicate gum tissue — chill in the fridge, not the freezer.
• A clean finger or damp washcloth. Firm gum massage works because it does the same thing chewing does: it counter-stimulates the nerves around the erupting tooth.
• A wet, frozen washcloth knotted at one end. Cheap, effective, and the gold standard for first molars.
• Infant acetaminophen, in correct weight-based dosing, for one or two especially rough nights. Cleared with your pediatrician, of course.

What to skip, per FDA and AAP guidance:

• Benzocaine gels (Orajel, Anbesol). The FDA has explicitly warned against these for children under 2 because of a rare but real risk of methemoglobinemia, a serious blood disorder.
• Amber teething necklaces. No proven mechanism, real strangulation risk. Multiple pediatric organizations have come out against them.
• Homeopathic teething tablets. The FDA has flagged inconsistent dosing of belladonna in some products as a safety concern.

For an exhaustive comparison of the soothing options moms in our community actually use — and the ones they regret — the Wermom editorial team published a separate research overview of evidence-based teething aids last spring.

When to call the pediatrician

The shortcut for sleep-deprived parents: if you're asking "is this teething or something else?" — it's worth a call. But specifically, these signal something other than teeth:

• Rectal temperature above 100.4°F (38°C), at any age
• Fever in a baby younger than 3 months — always urgent, regardless of cause
• Refusing to drink fluids for more than 6–8 hours, or fewer than four wet diapers in 24 hours
• Diarrhea lasting more than 24 hours, or any blood in the stool
• A rash that doesn't blanch when you press it
• Lethargy, floppiness, or unusual difficulty waking
• Persistent inconsolable crying for more than 2–3 hours

None of these mean something catastrophic is happening — most of the time, the pediatrician will reassure you. But "I'll wait, it's probably teething" is the kind of self-soothing that occasionally costs a child an early-treatment window. The threshold for calling should be lower in the first year, not higher.

The night-waking question

Almost every parent reading this is here because of nights. Teething disrupts sleep, briefly and modestly. Multi-week sleep regressions are almost never teeth — they're developmental leaps, schedule mismatches, or, in the four-month window, the permanent reorganization of sleep architecture that every baby goes through. We have a separate piece on the 4-month sleep regression survival playbook if that's where you actually are.

If your baby is waking five times a night and your only theory is teeth, it's worth tracking the pattern for a week before committing to that explanation. Patterns reveal causes that single nights hide.

One last thing about teething culture

Parents have been blaming everything on teeth since at least the 17th century, when medical texts attributed roughly half of all infant deaths to "difficult dentition." We now know those babies were dying of infection, not enamel. The cultural muscle memory is older than germ theory.

Teething is real, modest, and survivable. Most of what your baby goes through during the eruption window will be inconvenient rather than alarming. The job of a clear-eyed parent isn't to dismiss the teeth — it's to refuse to use teeth as a default explanation for everything that happens in the second half of the first year. When something doesn't fit the teething pattern, name it correctly and act on it.

Your child will end up with twenty primary teeth. Most of them you will not notice arriving. The two you do notice will not be as dramatic as the internet promised.

A publication of Wermom Essentials — evidence-based parenting tools, reviewed by 16 medical advisors.