At 3 months old, your baby is probably not teething yet, but it can look a lot like they are. The average age for a first tooth is around 30 weeks, or about 7 months, with most babies getting their first tooth somewhere between 6 and 12 months. What you’re likely seeing at 3 months is a normal developmental milestone where your baby’s salivary glands become more active and everything starts going into their mouth. That said, a small number of babies do teethe early, so here’s how to tell the difference.
Why 3-Month-Olds Seem Like They’re Teething
Around 3 to 6 months, babies enter a phase where the mouth becomes their primary tool for exploring the world. Drooling ramps up dramatically, they start blowing bubbles, and they chew on anything they can grab. This is driven by salivary gland development, not teeth. Your baby’s salivary glands are maturing and producing more saliva than they can swallow, which creates the impression that something is happening in their gums.
At this age, babies also discover their hands and start putting fists and fingers in their mouths constantly. It’s easy to interpret this as gum pain, but it’s actually a completely normal sensory behavior. The combination of drooling, chewing, and occasional fussiness can be convincing, but on its own, none of it means a tooth is on the way.
Actual Signs of Teething
A prospective study published in Pediatrics tracked babies through tooth eruption and found a specific cluster of symptoms that are statistically linked to teething. These include increased biting, drooling, gum rubbing, increased sucking, irritability, wakefulness, ear rubbing, a rash around the face, decreased appetite for solid foods, and a mild rise in temperature. The key word is “cluster.” One or two of these symptoms alone, especially drooling or chewing, don’t reliably point to teething.
The most telling physical sign is what you can see and feel in the gums. If your baby is actually teething, you may notice:
- Swollen or puffy gums along the lower front ridge, since the two bottom front teeth (lower central incisors) almost always come in first
- A visible white line just beneath the gum surface where the tooth is pushing through
- Redness or tenderness in one specific spot rather than general fussiness
Run a clean finger along your baby’s lower gum line. If you feel a hard, sharp ridge or bump, a tooth may genuinely be close to breaking through. If the gums feel smooth and soft, the symptoms you’re seeing are more likely developmental.
Teething vs. Ear Infection
One overlap that catches parents off guard is ear rubbing. Teething babies rub their ears because the nerves in the jaw and ear are connected, and gum pain can radiate. But ear pulling is also a hallmark of ear infections, and the two look nearly identical from the outside.
A useful way to tell them apart: watch where your baby’s hands go most often. If hands are going to the mouth more than the ear or side of the head, teething is more likely. Fever and disrupted sleep are rarely caused by teething, so if your baby has a true fever (over 100.4°F) along with ear pulling and poor sleep, an ear infection is more probable. That same Pediatrics study found that fever over 102°F was not significantly associated with tooth eruption at all.
What Teething Does Not Cause
There’s a long-standing belief that teething causes high fevers, diarrhea, and general illness. Research doesn’t support this. While teething can cause a very mild temperature bump, it does not cause fevers above 102°F. Congestion, cough, vomiting, loose stools, and decreased appetite for liquids also showed no significant link to teething in clinical studies. If your 3-month-old has any of these symptoms, something else is going on, and the timing with drooling or fussiness is coincidental.
This matters because attributing real illness to teething can delay treatment. A 3-month-old with a fever of 100.4°F or higher needs medical evaluation regardless of what the gums look like.
Safe Ways to Soothe Sore Gums
If your baby does turn out to be an early teether, safe relief options are simple. A clean, wet washcloth placed in the freezer for about 30 minutes makes an effective teething tool. Pull it out before it freezes solid so it doesn’t bruise tender gums. Solid silicone teething rings (chilled in the refrigerator, not the freezer) also work well. Your clean finger, gently rubbed along the gums, provides counter-pressure that many babies find soothing.
What you should avoid is more important than what you try. The FDA warns against using any numbing gels or creams containing benzocaine or lidocaine on infants. Benzocaine can cause a rare but serious condition where the blood’s ability to carry oxygen drops dangerously low. Lidocaine solutions can cause seizures, heart problems, and severe brain injury if too much is applied or accidentally swallowed. Homeopathic teething tablets are also flagged by the FDA as potentially dangerous.
Skip the Amber Necklace
Amber teething necklaces are widely sold with claims that the amber releases a natural pain reliever when warmed by the skin. There is no clinical evidence supporting this. What does exist is a clear record of harm. The FDA has received reports of infant deaths from strangulation caused by these necklaces. Testing by the American Society for Testing and Materials found that 8 out of 15 amber necklace clasps required more than 15 pounds of force to open, which is enough to obstruct a small child’s airway before the clasp gives way. The beads also pose a choking hazard if the string breaks, and lab analysis has found bacterial colonization on all tested necklaces, with 32 different species identified. The American Academy of Pediatrics, along with pediatric organizations in Canada and Brazil, advises against any necklaces, chains, or strings worn around the neck of children under 3.
When to Expect the First Tooth
For most babies, the first tooth appears around 6 to 7 months. The two bottom front teeth come in first, followed by the two top front teeth, then the teeth on either side of those, then the first molars, canines, and finally the second molars. The full set of 20 baby teeth is typically in place by about 30 months. Some babies don’t get their first tooth until after their first birthday, and that’s also within the normal range.
If your 3-month-old truly is cutting a tooth, they’re early but not unheard of. The gums will tell the story more reliably than any single behavior. Keep checking that lower gum ridge every few days, and in the meantime, enjoy the drool bibs and the adorable bubble-blowing phase for what it is: your baby growing right on schedule.