What Age Do Newborns Start Teething? | The Real Timeline

Most babies start teething around 6 months of age, though it’s normal for teething to begin as early as 3 months or as late as 12 months.

You’ve probably heard that teething starts at six months, but the reality is messier. Some babies are born with a tooth already poking through, while others won’t see their first pearly white until after their first birthday.

That wide range can be frustrating when you’re trying to plan, but it’s completely normal. In fact, the teething process itself begins months before any tooth breaks through, with drooling and chewing often starting around 2 to 4 months. This article covers the real teething timeline, how to spot the early signs, and when to talk to your pediatric dentist.

What Age Do Most Babies Start Teething?

Most babies start teething around 6 months of age, though it’s normal to begin as early as 3 months or as late as 12 months. The American Academy of Pediatrics notes teething usually starts between four and seven months.

Babies who start teething before 4 months are still within the normal range. Some are even born with teeth — called natal teeth — or develop them within the first 30 days, known as neonatal teeth.

On the other end, some babies don’t get their first tooth until after their first birthday. This can cause worry, but most cases are simply variations of normal timing.

Why Teething Timelines Vary So Much

If a friend’s baby had teeth at 4 months and yours is still toothless at 9 months, it’s natural to wonder whether something’s wrong. The truth is that teething timing is influenced by several factors, most of which are nothing to worry about.

• Genetics: If you or your partner got teeth early or late, your baby may follow a similar pattern.
• Premature birth: Preemies often reach teething milestones later than full-term babies, adjusted for their corrected age.
• Individual variation: Just like walking or talking, teething has no fixed schedule. The order of eruption also varies — lower central incisors usually appear first, but upper ones sometimes beat them.
• Nutrition and health: Adequate nutrition supports normal tooth development, but significant delays should be checked by a pediatrician.

Keep in mind that early teething doesn’t mean more advanced development, and late teething doesn’t signal a problem. Most children end up with a full set of 20 primary teeth by age 3, regardless of when the first one appeared.

The First Teeth to Appear and What to Expect

Most babies get their lower central incisors first — the two bottom front teeth. Upper central incisors usually follow soon after. The entire set of 20 primary teeth will come in gradually over the next couple of years.

A helpful mnemonic used in pediatric dentistry is the 7+4 rule: by 7 months, a baby typically has their first four teeth, and new teeth emerge every four months after that. University of Utah Health explains that the teething process itself — drooling and chewing — begins as early as 2 months, long before any tooth breaks through. They note that the begins at 2 months, so those early signs are part of the journey.

Even with the 7+4 rule, individual babies can be faster or slower. The key is to track the general trend — most children have 8 teeth by 12 months and 16 by 2 years. By age 3, all 20 primary teeth should be present.

While this rule is a helpful guideline, your baby may not follow it exactly. What matters is that teeth are coming in steadily and your child is developing normally.

How to Tell If Your Baby Is Teething

It can be hard to know if your baby is teething or just having a fussy day. Look for a combination of these common signs, which usually appear a few days before a tooth breaks through.

1. Increased drooling: Many babies start drooling heavily around 2 to 4 months, though this can also be normal development.
2. Chewing on hands or objects: Babies often gnaw on their fingers, toys, or teething rings to relieve gum pressure.
3. Irritability and disrupted sleep: Teething can cause brief periods of crankiness, waking more at night, and changes in appetite.

For many babies, these signs appear a few days before a tooth emerges and tend to fade once the tooth breaks through. If the symptoms last longer or seem severe, a checkup with your pediatrician can help rule out other causes.

When to See a Dentist and How to Care for New Teeth

The American Academy of Pediatrics recommends that children have their first dental visit by their first birthday. This early visit helps catch any issues and sets the stage for good oral health habits.

Good oral care starts as soon as that first tooth appears. The AAP advises using a smear of fluoride toothpaste the size of a grain of rice and brushing gently twice a day. Per the teething at 6 months guide on the NHS site, most babies begin teething around six months, but they also emphasize that early or late teething is typically normal.

If your baby hasn’t had any teeth by 18 months or seems to have significant delays in tooth eruption, a pediatric dentist can evaluate for underlying issues. But for the vast majority, the wide timeline is nothing to worry about.

The Bottom Line

In short, there’s a wide normal range when it comes to teething. Most babies get their first tooth around 6 months, but starting at 3 months or waiting until 12 months is also common. The process itself begins earlier, with drooling and chewing often appearing at 2 to 4 months. Keep an eye on the signs, and don’t hesitate to ask your pediatrician if you’re concerned.

Your pediatrician or pediatric dentist can reassure you if your baby’s teething timeline falls outside the typical range — especially if no teeth have appeared by 18 months.