Teething-related sleep disruptions typically last a few days to about a week per tooth, clustering around the days just before and after each tooth breaks through the gum. But because babies get 20 primary teeth over a span of roughly two years, it can feel like teething is constantly interfering with sleep, even though each individual episode is short-lived.
Interestingly, recent research suggests teething may affect sleep less than most parents believe. A longitudinal study using video monitoring found no significant differences in total sleep time, nighttime awakenings, or parental crib visits on nights surrounding a tooth eruption compared to non-teething nights. Yet in the same study, 55% of parents reported their child slept less during teething, and 87% said their baby woke more often. The gap between what parents perceive and what objective data shows is striking, and it points to an important reality: other factors are often at play when your baby’s sleep falls apart.
The Teething Timeline
Most babies get their first tooth around 6 months of age, and the full set of 20 primary teeth is usually in place by age 2 to 3. The lower front teeth (central incisors) tend to arrive first, followed by the upper front teeth, then the teeth work their way toward the back of the mouth. First molars typically come in between 13 and 19 months, and second molars between 23 and 33 months.
Each tooth’s active eruption phase, when it’s pushing through the gum tissue, lasts only a few days. The discomfort your baby feels is concentrated in that narrow window. So while the overall teething process spans years, the sleep disruption from any single tooth is brief. If your baby has been sleeping poorly for weeks on end, teething alone is unlikely to be the cause.
Why Teething Feels Worse at Night
During the day, babies are distracted by feeding, play, and new experiences. At night, there’s nothing to compete with the sensation of sore, swollen gums. Your baby is also lying down, which can increase blood flow to the head and make inflamed gums feel more uncomfortable. The combination of fewer distractions and a horizontal position means that even mild gum soreness can become the thing your baby fixates on at 2 a.m.
This creates a pattern that many parents recognize: a baby who seems mostly fine during the day but becomes fussy and wakeful at night. It’s not that the pain suddenly gets worse. It’s that there’s nothing else to feel.
Molars vs. Front Teeth
Not all teeth cause equal trouble. Front teeth (incisors) are thin and sharp, and they cut through the gum relatively quickly. Molars are a different story. They have a broad, flat surface that has to push through more tissue, and many parents report that molar eruptions cause more noticeable discomfort and sleep disruption than incisors did.
First molars arrive around 13 to 19 months, and second molars between 23 and 33 months. These later eruptions often coincide with other developmental changes, like separation anxiety or sleep regressions, which can make it hard to tell what’s actually causing the nighttime trouble. If your toddler is suddenly waking more, molars are a reasonable suspect, but they’re rarely the only thing going on.
Signs It’s Not Just Teething
Parents often attribute weeks of poor sleep to teething when something else is responsible. Teething does not cause high fever, and it won’t push your baby’s temperature to 100.4°F (38°C) or above. It may raise body temperature slightly, but a true fever is a sign of infection, not teething. If your baby has a fever alongside sleep problems, look for other causes.
Ear infections are one of the most common conditions mistaken for teething. Both can cause fussiness, disrupted sleep, and ear pulling. But ear infections tend to come on suddenly, often follow a cold, and cause more intense discomfort when the baby is lying flat. Other signs that point toward an ear infection rather than teething include:
- Fever over 100.4°F
- Cold symptoms like cough or runny nose
- Fluid draining from the ear
- Pain that worsens when lying down rather than on-and-off irritability
Teething also doesn’t cause diarrhea or intense, sustained irritability. If your baby seems genuinely sick rather than just uncomfortable, something other than teething is likely involved.
What Actually Helps at Night
The American Academy of Pediatrics recommends simple, physical comfort measures for teething pain. Rubbing your baby’s gums with a clean finger can provide relief through counter-pressure on the swollen tissue. A firm rubber teething ring (not frozen, which can be too hard and damage gums) gives your baby something to chew on before bed.
What you should avoid matters just as much. The FDA warns against using topical gels or creams containing benzocaine or lidocaine on babies’ gums. These products offer little benefit for teething pain and carry serious risks, including a rare but dangerous blood condition. Homeopathic teething tablets are also flagged: FDA testing found that some products contained inconsistent and potentially harmful levels of belladonna-derived compounds. The agency urges parents to dispose of any homeopathic teething tablets they have at home.
For nighttime comfort specifically, try to keep your baby’s sleep routine as consistent as possible. A teething baby benefits from the predictability of their normal bedtime sequence. If you introduce extra night feeds or co-sleeping as a temporary fix, those habits can outlast the teething episode and create a new sleep problem that has nothing to do with teeth.
Keeping Perspective on the Timeline
The worst sleep disruptions from teething tend to happen during two windows: the first few teeth around 6 to 10 months, when the experience is entirely new, and the molars between 13 and 33 months. In between, many parents find that their baby handles tooth eruptions with minimal fuss, especially once a few teeth have already come through and the sensation is no longer unfamiliar.
Each episode typically resolves within a week. If your baby’s sleep has been disrupted for longer than that, it’s worth considering other explanations: a growth spurt, a developmental leap, a schedule that needs adjusting, or an illness that’s being masked by the assumption of teething. The objective data on teething and sleep suggests that parents tend to overestimate its impact, not because they’re imagining things, but because teething is visible and easy to point to when sleep goes sideways. Sometimes it’s the culprit. Often, it’s just one piece of a bigger picture.