What Age Do Infants Start Teething? | What Pediatricians Say

Most infants begin teething between 4 and 7 months of age, though some start as early as 3 months or as late as 12 months.

You probably expect your baby’s first tooth to pop through right around six months. But the real range is wider than many parents realize — some infants start drooling and chewing as early as three months, while others don’t show a single pearl until after their first birthday.

The honest answer is that there’s a broad normal window for teething. This article walks through typical timelines, why variation is common, and when a call to your pediatrician might make sense.

When Do Most Babies Start Teething?

Pediatricians generally agree that teething starts between 4 and 7 months of age. The American Academy of Pediatrics pegs the typical range at 4 to 7 months, with the lower central incisors — the two bottom front teeth — usually appearing first.

That said, “normal” covers a lot of ground. Some perfectly healthy babies cut their first tooth at 3 months, while others don’t see one until 12 months or later. Both ends of that spectrum are widely considered within the healthy range.

A handy rule of thumb called the 7-4 rule estimates that most babies have their first four teeth by 7 months, then get about four new teeth every four months after that, finishing the full set of 20 by age 2½ to 3 years. It’s a rough guide, not a strict schedule.

Why The Timeline Varies So Much

Every baby develops at their own pace, and teething is no exception. Genetics play a big role — if you or your partner teethed early or late, your baby may follow the same pattern. Here’s how the typical categories shake out:

• Early teething (3–4 months): A small number of infants start showing signs of teething — drooling, chewing on fists — well before the average. This is generally not a cause for concern.
• Average teething (4–7 months): Most babies fall into this window. The lower central incisors are usually the first to erupt, followed by the upper central incisors a month or two later.
• Late teething (after 12 months): Some babies don’t get their first tooth until after their first birthday. Delayed teething of this sort is typically just a normal variation, not a sign of a problem.

Premature or low-birth-weight infants may teethe a bit later on average, but the range is still wide. The key is the overall pattern of development, not a single milestone.

What To Expect During The Teething Process

Before a tooth actually breaks through the gum, you may notice your baby becomes droolier, crankier, and more inclined to chew on anything within reach. Per the University of Utah Health, the 2 to 4 months, even though the first tooth may not appear for another month or two.

Common teething signs include swollen or tender gums, mild irritability, increased chewing, and disrupted sleep. A low-grade fever (under 101°F) may accompany teething, but higher fevers, diarrhea, or rashes are not typical teething symptoms — call your pediatrician if those appear.

Eruption usually follows a predictable order: lower central incisors first, then upper central incisors, then lateral incisors, first molars, canines, and second molars. But the order can vary from baby to baby and still be completely normal.

A Typical Tooth Eruption Schedule

The 7-4 rule gives a rough map of how many teeth to expect and when. Keep in mind these are averages — your baby may be a month or two ahead or behind.

These ranges are compiled from pediatric dentistry guidelines. If your baby’s pattern looks different but they’re meeting other developmental milestones, it’s usually nothing to worry about.

What If My Baby Hasn’t Started Teething Yet?

If your baby is 12 months old with no teeth, you’re not alone — many infants hit this mark without a single tooth. The NHS notes that while most babies start teething around 6 months, it’s perfectly normal for some to wait until after their first birthday. You can read more in the babies start teething guide on their site.

Some sources consider a child “late teething” if no teeth have erupted by 12 months. But late teething is usually just a variation of normal, especially if your baby is otherwise growing well, eating purees or soft foods, and hitting motor milestones.

Pediatric dentists typically recommend a first dental visit by age 1 or within six months of the first tooth. If you’re concerned about a delay, that visit is a perfect time to ask — a quick exam can rule out rare issues like missing tooth buds.

The Bottom Line

Teething timelines are flexible: most babies start between 4 and 7 months, but starting at 3 months or as late as 12 months is still within the broad normal range. Watch for drooling, chewing, and mild irritability as cues, and remember that the 7-4 rule is a rough estimate, not a promise.

Your pediatrician knows your baby’s growth curve and milestone pattern best. If you’re worried about late teething, bring it up at your 9- or 12-month well-child visit — a quick look at your baby’s gums and overall development will usually put your mind at ease.