Teething Fever: Is It Real? What Parents Actually Need to Know

Here’s what nobody tells you about teething fever: most pediatricians agree it doesn’t exist. You’ll hear it everywhere—from grandparents, online forums, even some well-meaning healthcare providers—but the clinical evidence is clear: teething does not cause a true fever. What it does cause is gum inflammation, drooling, and general fussiness. A real fever (100.4°F or higher) means something else is going on, and that distinction can make the difference between catching an actual infection early and missing it. This guide clears up the confusion and helps you know exactly what to watch for.

Is Teething Fever Actually a Thing? What the Research Says

It’s one of the most common things new parents hear: “That’s just teething fever.” The idea is so widespread it feels like fact. But the clinical evidence tells a different story.

Multiple studies have examined the link between teething and elevated body temperature. What they consistently find is that teething may cause a very slight rise in baseline temperature — but not a true fever. A true fever is defined as a rectal temperature of 100.4°F (38°C) or higher. The temperature fluctuations associated with teething generally fall well below that threshold.

The AAP is direct on this point: teething does not cause fever. If your baby has a temperature of 100.4°F or above, something else is going on — and it warrants attention, not dismissal.

This distinction matters more than it might seem. Teething typically begins around six months, which is also when maternal antibodies that passed through the placenta start to decline. That timing means babies become more vulnerable to infection right when teeth are coming in. A fever during this window can easily get attributed to teething when it’s actually the body responding to a virus or bacterial infection.

Gum inflammation, drooling, fussiness, and disrupted sleep are documented signs of teething. A temperature high enough to count as fever is not on that list. If you’re ever uncertain whether what you’re seeing is normal teething discomfort or something that needs medical input, that uncertainty is reason enough to call your pediatrician.

And if a true fever does appear alongside teething, knowing the right dose of fever reducer matters — our guide on infant tylenol dosage walks through weight-based dosing and when it’s actually appropriate to use.

What Temperature Counts as a Teething Fever—And What Doesn’t

The AAP defines a fever as a rectal temperature of 100.4°F (38°C) or higher. That number matters because it draws a clear line between what teething actually does to your baby’s body and what it doesn’t.

Teething can cause a slight rise in baseline temperature — typically no higher than 99°F (37.2°C). This is a real, measurable effect, likely linked to the low-grade inflammation happening in the gum tissue as a tooth pushes through. It’s not the same as a fever, and calling it a “teething fever” overstates what’s actually occurring.

What you might notice: your baby feels slightly warmer than usual, is drooling more, is gnawing on everything in reach, and is generally more irritable than normal. These fit the documented profile of teething discomfort. A temperature that climbs to 101°F, 102°F, or beyond does not. At that point, something else is happening — a virus, an ear infection, or another illness — and it’s worth a call to your pediatrician to find out what.

Timing creates the confusion. Teething typically begins around six months, which also happens to be when the immunity passed from you during pregnancy starts to wane. Your baby becomes more susceptible to common illnesses right around the same time teeth are coming in. The two events coincide frequently enough that fever often gets attributed to teething by default. It’s an understandable conclusion — but not an accurate one.

If you’re navigating all the changes that come with this stage, it’s worth knowing that oral health begins earlier than most people expect. Understanding when do you start brushing infants teeth gives you a clearer picture of what to do once those first teeth actually arrive.

Why Babies Run Low-Grade Fevers During Teething (If They Do)

When a tooth breaks through the gum, it triggers a localised inflammatory response. The surrounding tissue swells, blood flow increases, and the immune system responds to the disruption. That process — entirely normal, entirely mechanical — is the most plausible explanation for why some babies show a slight temperature rise during tooth eruption.

The key word is slight. Research consistently shows that teething may be associated with a minor increase in body temperature, but not with true fever. A temperature of 38°C (100.4°F) or above is the clinical threshold for fever. The AAP states that teething does not cause high fever — and that any temperature reaching that threshold should be evaluated for another cause, not attributed to an emerging tooth.

What you might actually observe is a temperature sitting in the 37.2–37.8°C range — warmer than baseline, but not technically a fever. This falls within the range that inflammation alone can produce. The gum tissue is doing real biological work. Some babies show this. Many don’t. Both are normal.

The distinction matters because teething fever, as a concept, is widely accepted by caregivers but not well supported by clinical evidence. A large-scale study published in Pediatrics tracked temperature changes against tooth eruption events and found no consistent pattern of true fever. Mild temperature elevations appeared in some children around eruption days — but not reliably, and not at fever-level readings.

If your baby is running a genuine fever alongside other symptoms — congestion, vomiting, diarrhoea, unusual lethargy — teething is not the explanation. Those signs point elsewhere, and they deserve their own assessment. Teething is uncomfortable. It is not, on its own, a systemic illness.

Red Flags: When That Fever Isn’t About Teething

The AAP is direct on this point: a rectal temperature of 100.4°F (38°C) or higher is a fever. Anything below that threshold is a temperature variation, not a fever — and that distinction matters when you’re trying to figure out what’s actually going on with your baby.

Teething does not cause high fevers. If your baby’s temperature clears 100.4°F, something else is driving it. The timing may feel connected — teething typically begins around six months, the same window when maternal antibodies start to wane and babies become more vulnerable to common infections. That overlap is why illness and teething so often appear together. But appearing together is not the same as being caused by the same thing.

There are specific signs that point away from teething and toward infection or illness. Watch for these:

• Fever above 100.4°F (38°C) rectally
• Fever that persists beyond 24 hours
• Vomiting or diarrhoea
• Congestion, coughing, or ear-pulling alongside a fever
• A rash that spreads or appears on the trunk — not just around the mouth
• Unusual lethargy, difficulty waking, or signs of dehydration
• Any fever in a baby under three months old, regardless of cause

That last point carries extra weight. The AAP recommends that any fever in an infant under three months old be evaluated by a doctor promptly — no wait-and-see approach. In very young babies, fever is a warning sign until proven otherwise.

A so-called teething fever that comes with any of the symptoms above isn’t a teething symptom at all. It’s your baby’s body signalling that something else needs attention. Trust that signal. Teething is local irritation at the gumline — it does not cause vomiting, it does not cause congestion, and it does not make a baby too tired to respond normally to you.

How to Soothe Teething Discomfort Without Fever Confusion

Teething causes real discomfort. The gums swell as a tooth pushes through, and that localized pressure can make your baby irritable, drooly, and harder to settle. The goal is to address that specific source of irritation — without reaching for anything that could mask a fever you need to know about.

The American Academy of Pediatrics recommends starting with the simplest interventions first. A clean finger pressed gently against the gumline provides counter-pressure that many babies find immediately calming. A chilled (not frozen) teething ring works on the same principle — cold reduces local inflammation and temporarily numbs the area. Frozen teethers can be too hard and may damage emerging gum tissue, so keep it in the refrigerator, not the freezer.

The CDC advises against benzocaine-based teething gels for children under two. These products can reduce oxygen in the blood — a risk that outweighs any brief relief. Homeopathic teething tablets have also drawn FDA warnings due to inconsistent belladonna levels. Neither is worth the uncertainty.

If your baby is already eating solids, chilled purees or a mesh feeder with cold fruit can offer the same gum-pressure relief with the added benefit of nutrition. If you’re still navigating that transition, our guide on when to start solid foods covers the full readiness picture.

On the question of infant acetaminophen or ibuprofen: both are appropriate for confirmed teething discomfort in the right age range and dose, according to AAP guidelines. But use them to address pain — not preemptively, and not as a way to bring down a number on a thermometer before you’ve assessed whether that number matters. If your baby has a true fever alongside teething, treat the fever as its own clinical event and contact your pediatrician.

Comfort measures work. They just work best when you’re clear on what you’re treating.

When to Call Your Pediatrician About Teething Fever

The AAP is clear on this: true teething does not cause high fever. A slight rise in gum temperature from inflammation is plausible, but a rectal temperature at or above 100.4°F (38°C) in an infant is considered a fever and warrants evaluation — regardless of whether teeth are coming in.

Use these thresholds as your guide:

Call your pediatrician same day if your baby has a temperature between 100.4°F and 102.2°F alongside unusual fussiness, ear pulling, reduced wet diapers, or refusal to feed. These symptoms together suggest something beyond teething.

Seek care promptly — same day or urgent care if the fever climbs above 102.2°F, has lasted more than two days, or keeps returning after it resolves. A recurring low-grade fever is not a teething pattern. It’s a reason to look further.

Go to the emergency room or call 911 if your baby has a fever above 104°F, is difficult to wake, has a seizure, develops a rash alongside fever, or is under 3 months old with any fever at all. The AAP recommends all infants under 3 months with a rectal temperature of 100.4°F or higher be evaluated immediately — no wait-and-see at that age.

Symptoms that are never explained by teething: diarrhea severe enough to cause dehydration, persistent vomiting, significant rash, or respiratory symptoms. If you’re seeing any of these alongside a fever, contact your pediatrician directly. If your baby is already showing signs of distress and you’re unsure, postpartum anxiety can make it genuinely hard to calibrate what’s urgent — that’s worth acknowledging, and worth talking to your own provider about too.

When in doubt, call. Pediatricians expect these questions. A brief phone triage is always appropriate.

Sources

• American Academy of Pediatrics (AAP) — Fever in infants and children: definition, measurement, and clinical guidance on when teething is and is not the cause.
• American Academy of Pediatrics — Comprehensive health guidance on teething symptoms and fever differentiation in infants.

Frequently Asked Questions

Can teething actually cause a fever in babies?

No. According to the AAP, teething does not cause a true fever (defined as 100.4°F or higher rectal temperature). Teething may cause a slight rise in baseline temperature—typically no higher than 99°F—due to gum inflammation, but this is not considered fever. If your baby has a temperature of 100.4°F or above, something else is causing it and warrants medical attention.

What temperature is considered a teething fever?

There is no such thing as a true teething fever. However, teething may cause a slight warmth or baseline temperature rise up to about 99°F (37.2°C). A fever is defined as 100.4°F (38°C) or higher when measured rectally. Any temperature at or above 100.4°F indicates infection or illness, not teething.

How do I know if my baby’s fever is from teething or an infection?

The most reliable way is temperature. If your baby’s temperature is 100.4°F or higher, it’s not teething—it’s an infection or illness. Documented teething symptoms include gum swelling, drooling, chewing, and fussiness, but not fever. If you’re uncertain, contact your pediatrician rather than assume it’s teething.

Is it safe to give my teething baby fever-reducing medication?

If your baby actually has a fever (100.4°F or higher), fever-reducing medication may be appropriate—but dosing must be weight-based and given under pediatric guidance. For teething discomfort alone (without fever), comfort measures like cold teething rings and gentle gum massage are safer first steps. Always consult your pediatrician before giving any medication.

When should I be worried about my baby’s fever during teething?

You should be worried immediately if your baby has any fever (100.4°F or higher), since teething doesn’t cause true fever. Additional red flags include fever lasting more than a few days, fever with other symptoms (rash, lethargy, difficulty breathing), or your baby seeming unusually unwell. Contact your pediatrician promptly in any of these situations.