Most 15-month-olds have between 4 and 8 teeth, though some have more and a few have less. By this age, the upper and lower front teeth (central and lateral incisors) have typically come in, and the first molars may be starting to push through. There’s a wide range of normal, and the exact count depends on genetics, nutrition, and your child’s individual pace.
What’s Typical at 15 Months
Baby teeth generally start appearing around 6 months, and all 20 arrive by about age 3. The first to show up are the two lower front teeth, followed by the four upper front teeth, then the two remaining lower front teeth. That gives most babies 8 incisors by roughly 12 months. Some children hit that milestone a little later, so having 4 to 6 teeth at 15 months is still perfectly normal.
At 15 months, your child is likely in the window for first molars. According to the American Academy of Pediatric Dentistry, upper and lower first molars erupt between 11 and 18 months. The Cleveland Clinic places that window at 13 to 19 months. These are the broader, flatter teeth further back in the mouth. If your toddler has some or all of their first molars coming in, they could have anywhere from 8 to 12 teeth. If the molars haven’t started yet, a count of 4 to 8 is typical.
Canines (the pointed teeth between the incisors and molars) come next, usually between 16 and 20 months. So at 15 months, your child probably doesn’t have those yet.
Why Some Toddlers Have Fewer Teeth
Tooth eruption timing is heavily influenced by genetics. If you or your partner were late teethers, your child is more likely to follow the same pattern. Some families simply have genes that produce teeth on a slower schedule, and this is completely normal.
Beyond genetics, several other factors can shift the timeline. Babies born prematurely often hit dental milestones later, though they typically catch up over time. Low birth weight and chronic malnutrition can slow things down because the body needs adequate resources to build and push out new dental tissue. Deficiencies in vitamin D, calcium, vitamin A, or vitamin C can also delay eruption. Vitamin D is especially important because it helps the body absorb calcium, which strengthens the bone structure teeth need to emerge through.
Less commonly, endocrine conditions like hypothyroidism or growth hormone deficiencies can affect the hormones that regulate tooth development. Prolonged use of certain medications, including steroids and repeated courses of antibiotics, has also been linked to slower dental development in some children.
When a Delay Actually Matters
In the general population, the first tooth erupts between about 6 and 10 months. Research published by the AAPD considers eruption “delayed” when a child’s first tooth hasn’t appeared by 10 months of chronological age. If your 15-month-old has at least a few teeth, there’s little reason for concern. If they have zero teeth by 12 to 13 months, it’s worth mentioning to your pediatrician or a pediatric dentist. They can check for underlying nutritional deficiencies or other conditions that might need attention.
Keep in mind that even among healthy, well-nourished toddlers, the spread is significant. Two 15-month-olds sitting side by side might have 4 and 10 teeth, respectively, and both can be perfectly healthy.
First Molars and Teething Discomfort
If your 15-month-old seems crankier than usual, first molars may be the reason. Because molars are larger than incisors, they tend to cause more discomfort as they break through. Common signs include increased drooling, red or swollen gums toward the back of the mouth, fussiness, difficulty sleeping, reduced appetite, and constant chewing on objects.
A slight increase in body temperature can happen during teething, but a true fever above 100.4°F (38°C) is not caused by teething. If your child has a high fever alongside what looks like teething symptoms, something else is going on and it’s worth a call to your pediatrician.
Caring for Those Early Teeth
However many teeth your toddler has, they need cleaning. Use a soft-bristled toothbrush with a smear of fluoride toothpaste about the size of a grain of rice. That’s the amount recommended by the American Academy of Pediatrics, the AAPD, and the American Dental Association for children under 3. Brush twice a day, paying attention to the gum line where plaque builds up.
To support enamel development, toddlers ages 1 to 3 need about 700 mg of calcium daily, which works out to roughly 2 to 3 servings of dairy or calcium-rich foods. Vitamin D is harder to get from food alone, so many pediatricians recommend a supplement. Ask your child’s doctor whether one makes sense for your family.
The AAPD recommends that every child have a dental home by age 1, meaning a first visit within six months of the first tooth erupting or by their first birthday, whichever comes first. If your 15-month-old hasn’t been to a dentist yet, scheduling that visit is a good next step. Early visits are brief and focused on checking that everything is developing normally.