When Do Babies Grow Teeth? Timeline

Most babies get their first tooth between 6 and 10 months of age. The two bottom front teeth usually come in first, followed by the two top front teeth. All 20 baby teeth are typically in place by around age 3, though the exact timing varies widely from child to child.

That range is wide on purpose. A tooth at 4 months can be normal. So can a first tooth at 12 months. What matters more than the calendar is the pattern — and knowing which signs actually point to teething versus something else.

When Do Babies Grow Teeth? The Full Timeline

Teeth begin forming long before you can see them. Tooth buds start developing in the gums during the second trimester of pregnancy. By birth, a baby has a full set of 20 primary teeth waiting beneath the surface.

The chart below shows the typical window for each group of teeth. These are general ranges, not deadlines. Some babies follow them closely. Others run early or late across the board.

Notice the order. Front teeth tend to arrive before back teeth. The molars come last because they are larger and need more time to work through the gum.

One detail that surprises many parents: girls often get teeth slightly earlier than boys on average. The difference is small and not something to worry about either way.

What Are the First Signs of Teething?

The most reliable sign is a visible tooth or a swollen gum where a tooth is pushing through. Everything else is less certain than it is often made out to be.

Common signs parents report include:

• More drooling than usual
• Gums that look swollen or feel tender
• Chewing on fingers, toys, or anything within reach
• Fussiness or irritability
• Mild gum discomfort

Here is where honesty matters. Many symptoms people blame on teething — fever, diarrhea, rash, poor sleep — often have other causes. Research on this topic has repeatedly found that teething does not reliably cause high fever or significant diarrhea. When a baby has those symptoms, teething is usually not the explanation, and a doctor should take a look.

A low-grade temperature under 100.4°F can happen with teething. A true fever of 100.4°F or higher is not a typical teething sign and deserves medical attention, especially in a baby under 3 months.

How Long Does Teething Last?

Teething is not one event. It is a process that stretches across roughly two and a half years.

Each individual tooth takes about a week to emerge through the gum. The days right before and after a tooth breaks through tend to be the most uncomfortable. Then things settle until the next tooth starts moving.

That means discomfort comes in waves, not a constant state. There are often weeks of calm between teeth.

The back molars are usually the hardest stretch for many babies. They are bigger, and they arrive later, when a toddler is more mobile and more aware of the discomfort.

Can Teething Cause Fever, Diarrhea, or a Runny Nose?

This is one of the most misunderstood parts of infant care. Parents are often told that teething explains almost any symptom. The evidence does not support that.

Some studies suggest teething may be linked to mild symptoms like increased drooling, gum rubbing, and slight irritability. The link to fever and diarrhea is weak and inconsistent. When those symptoms appear, it is safer to treat them as separate issues rather than assume teething is the cause.

This matters because serious illness in babies can look like ordinary fussiness at first. If a baby has a fever, vomiting, diarrhea, or unusual lethargy, contact a doctor. Do not wait it out assuming a tooth is coming.

When Should You Be Concerned About Delayed Teeth?

A baby with no teeth by 12 months is usually still within the normal range. Some children simply run late. A family pattern of late teething is common.

It is worth talking to a pediatrician or pediatric dentist if:

• No teeth have appeared by around 18 months
• Teeth come in out of the usual order or look unusual in shape
• There are signs of a developmental or growth concern

These situations are not automatically a problem, but they are worth a professional look. In rare cases, delayed or unusual tooth eruption can be linked to an underlying condition. A clinician can sort out whether further evaluation is needed.

How Can You Ease Teething Discomfort?

Simple measures work well for most babies. A chilled teething ring — refrigerated, not frozen — can soothe sore gums. A clean finger rubbed gently along the gum can help too.

Frozen teething rings are not recommended. They can be too hard and can hurt tender gums.

For pain, follow your pediatrician’s guidance. Acetaminophen or ibuprofen can be used for infants at the correct dose for their weight and age, but ibuprofen is not given to babies under 6 months. Always confirm the dose with a clinician — never estimate it yourself.

One warning worth stating plainly: teething gels that contain benzocaine should not be used in babies. They carry a risk of a serious blood condition called methemoglobinemia, and regulatory agencies have advised against them for infants. Homeopathic teething tablets have also been linked to safety concerns and are best avoided.

Does Teething Affect Sleep and Feeding?

Some babies sleep worse and feed differently when a tooth is coming through. Others barely seem to notice.

The discomfort is real but usually mild and short-lived. If a baby refuses to feed for more than a day, seems to be in significant pain, or has other symptoms like fever, that is a reason to check with a doctor rather than assume teething.

It helps to remember that teething and other common infant issues often overlap. A baby can be teething and have a cold at the same time. Blaming everything on teeth can hide something that needs attention.

How Should You Care for New Baby Teeth?

Dental care starts with the first tooth. Wipe or brush the tooth with a soft infant toothbrush and a tiny smear of fluoride toothpaste — about the size of a grain of rice. This is the amount recommended for children under 3.

As more teeth appear, keep up the routine twice a day. The first dental visit is generally recommended by a child’s first birthday or within six months of the first tooth appearing, whichever comes first.

Baby teeth matter. They help a child chew, speak, and hold space for adult teeth. Cavities in baby teeth can affect the permanent teeth underneath, so early care is not just about the temporary set.

What About Being Born With a Tooth?

Occasionally a baby is born with one or two teeth already present, or a tooth appears in the first month. These are called natal or neonatal teeth. They are uncommon but not unheard of.

They can sometimes cause feeding problems or be loose enough to pose a choking risk. A dentist or pediatrician should evaluate them. Some are removed, and others are left in place if they are stable.

The Bottom Line on Teething Timelines

Every baby follows their own schedule. The ranges in this article describe what is typical, not what is required. A first tooth at 4 months and a first tooth at 12 months can both be completely normal.

What is worth your attention is the pattern and the symptoms. Trust visible signs like swollen gums and emerging teeth. Be cautious about blaming fever, diarrhea, or serious fussiness on teething. When in doubt, ask a doctor. That is not overreacting — it is good judgment.