Most 18-month-olds have between 12 and 16 teeth, though some toddlers may have a few more or fewer and still be perfectly on track. By this age, the eight front teeth (four on top, four on bottom) are usually in, and the first set of molars is either breaking through or already visible. The exact count varies from child to child, and a range of several months in either direction is normal.
Which Teeth Are In by 18 Months
Baby teeth arrive in a fairly predictable order. The lower central incisors (the two bottom front teeth) typically come first, around 6 to 10 months, followed closely by the upper central incisors. The lateral incisors, the teeth on either side of those front four, fill in over the next several months. By roughly 12 months, most babies have their eight incisors.
The next wave is the first molars, the broader teeth toward the back of the mouth. These start coming in between 13 and 19 months, which means an 18-month-old is right in the middle of molar territory. Because there are four first molars (two upper, two lower), a toddler who has all eight incisors plus all four first molars would have 12 teeth. Some children also begin cutting their canines (the pointed teeth between the incisors and molars) around this time, which adds up to four more, bringing the potential total closer to 16.
The full set of 20 baby teeth usually isn’t complete until around age 2½ to 3, so having fewer than 16 at 18 months is not a concern.
Why Some Toddlers Have More or Fewer
Genetics is the biggest factor. If you or your partner were early or late teethers, your child is more likely to follow the same pattern. Premature birth and low birth weight can also push the timeline back by a few months. Nutrition plays a role too, since the minerals that build tooth enamel need to be available during the months before a tooth surfaces.
Girls tend to get their teeth slightly earlier than boys on average, but the difference is small enough that it rarely matters in practice. What does matter is that teeth are appearing in roughly the right sequence, even if the calendar is off by a few months.
When Fewer Teeth Could Be a Concern
If your child has no teeth at all by 12 months, that warrants a dental visit. By 18 months, most pediatric dentists would expect at least a handful of teeth to be visible. A toddler with significantly fewer teeth than expected, or teeth that look unusually small, widely spaced, or discolored, should be evaluated.
Delayed eruption can sometimes be linked to conditions like hypothyroidism, certain genetic syndromes (including Down syndrome), or developmental differences that affect how teeth and bones form. These are uncommon, and in most cases a “late teether” is simply on the slower end of normal. A dentist can take X-rays to confirm that teeth are present beneath the gums and developing on schedule, even if they haven’t broken through yet.
What 18-Month Molar Teething Looks Like
If your toddler seems crankier than usual around this age, molars are a likely culprit. Because molars have a larger, flatter surface than incisors, they can be more uncomfortable as they push through the gums. Common signs include increased drooling, red or swollen gums near the back of the mouth, irritability, disrupted sleep, decreased appetite, and constant chewing on fingers or objects.
A slight rise in temperature can happen during teething, but a true fever above 100.4°F (38°C) is not caused by teething. If your child spikes a higher fever, something else is going on and needs attention separately.
Cold teething rings, gentle gum massage with a clean finger, and chilled (not frozen) soft foods can help with molar discomfort. This phase typically passes within a few days to a couple of weeks per tooth.
Caring for Those New Teeth
Even before all 20 teeth are in, oral care matters. Start brushing twice a day with a soft-bristled toothbrush as soon as the first tooth appears. For children under 3, the American Academy of Pediatrics, the American Academy of Pediatric Dentistry, and the American Dental Association all recommend using fluoride toothpaste in a “smear” about the size of a grain of rice. That tiny amount provides cavity protection while minimizing the fluoride a toddler might swallow.
The American Academy of Pediatric Dentistry recommends a first dental visit within six months of the first tooth appearing, or by a child’s first birthday. If your toddler is 18 months old and hasn’t been to a dentist yet, it’s a good time to schedule that initial checkup. The visit is usually quick and focused on making sure teeth are developing normally and that early habits are on the right track.