General guidance, not medical advice. If bad nights come with a fever of 38°C / 100.4°F or more, diarrhoea, vomiting, or a baby who seems unwell rather than uncomfortable, treat it as possible illness and speak to your doctor — see teething symptoms.
“It must be teething” is the default explanation for any run of bad nights in the first two years. Sometimes it is right. Often it is not, and the cost of getting it wrong is weeks of waiting for a tooth to fix a problem that was never about teeth.
How much does teething actually disrupt sleep?
Genuinely, but briefly. The research on teething symptoms finds discomfort clustered in a narrow window — roughly the day before a tooth cuts through to a day or two after. So the honest expectation is a few disrupted nights per tooth, not weeks.
Discomfort is also often worse at night: there is less to distract from it, and lying flat can increase the sensation of pressure in the gum. A baby who seemed fine all day can genuinely be more bothered at 1am.
Telling teething apart from the alternatives
| Pattern | Looks like | Most likely |
|---|---|---|
| 2–4 bad nights, then back to normal | Fussy, chewing, drooling, settles with comfort | Teething |
| Weeks of frequent waking, started around 4 months | Waking every 1–2 hours, naps down to 30–45 min | 4 month sleep regression |
| Bedtime fights and early waking, at 6–9 or 13–18 months | Nap refusal, bedtime drifting later | Nap transition |
| Takes ages to fall asleep, happy in the cot | Babbling, kicking, not distressed | Wake window too short — see wake windows |
| Screaming at bedtime, short fragmented sleep | Frantic before bed, second wind | Overtired — wake window too long |
| Sudden change with fever, poor feeding, lethargy | Seems unwell rather than uncomfortable | Illness — see a doctor |
| Clingy, fussy, new skill emerging | Practising rolling, crawling or standing in the cot | Developmental leap |
Three questions that usually settle it
- How long has it been going on? More than about a week of consistently bad nights is very unlikely to be one tooth. This is the single most useful question.
- Is the daytime affected in the same way? Teething discomfort does not politely confine itself to night-time. If days are completely normal and only nights collapsed, look at the schedule rather than the gums.
- Does comfort resolve it? A teething baby usually settles with holding, pressure on the gum, or pain relief. A baby whose wake windows no longer fit will fight sleep regardless of how much comforting they get.
A week of bad nights feels identical to three weeks of bad nights at 3am. NapNap logs every waking with the date, so you can see whether this really is a short spike that is already resolving — or a pattern that started three weeks ago and needs a different fix.
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What to do during genuine teething nights
- Offer comfort freely. A few nights of extra holding during real discomfort will not undo a sleep routine.
- Treat the pain before bed, not at 2am, if your baby is genuinely distressed and your doctor or pharmacist has advised pain relief. Timing it before sleep is more effective than reacting to a waking.
- Keep the routine identical. Same order, same room, same cues. Familiarity does a lot of work when something else is uncomfortable.
- Do not restructure the schedule. Dropping a nap or moving bedtime to solve a few teething nights creates a second, longer-lasting problem after the tooth is through.
- Keep the sleep space unchanged and consistent with safe sleep guidelines — nothing extra in the cot, and never a teething necklace for sleep.
- Return to normal quickly. Once the tooth is through, go back to whatever you were doing before within a night or two.
When teething becomes the excuse
The trap is that teething is almost always available as an explanation: from about 4 months to 3 years there is nearly always a tooth that could plausibly be coming. That makes it easy to attribute months of fragmented sleep to a rolling series of teeth and never look at anything else.
If you have been blaming teething for more than two or three weeks, the odds strongly favour something structural instead — wake windows that have outgrown the schedule, a nap that needs dropping, or a sleep association formed at bedtime. Those are all fixable, and none of them resolve by waiting.
Start with wake windows by age and the sample schedules. If the schedule is right and nights are still broken, sleep training methods covers the structured approaches.
Sources
- Macknin ML et al., Symptoms associated with infant teething: a prospective study, Pediatrics (2000).
- Massignan C et al., Signs and symptoms of primary tooth eruption: a meta-analysis, Pediatrics (2016).
- NHS, Baby teething symptoms. American Academy of Pediatrics, infant sleep and teething guidance.
Common questions
Can teething cause night waking?
Yes, but briefly. Expect a few disrupted nights around each tooth cutting through, not weeks. Discomfort is often more noticeable at night because there is less distraction and lying flat can increase the feeling of pressure in the gum.
How long does teething disrupt sleep?
Typically two to four nights per tooth, centred on the eruption itself. If bad nights have gone on for more than about a week, teething is unlikely to be the main cause.
How do I know if it is teething or the 4 month sleep regression?
Duration and pattern. Teething is a short spike that resolves in a few days. The 4 month regression is a sustained change lasting weeks, with waking every one to two hours and naps shortening to a single 30 to 45 minute cycle.
Should I change my baby’s schedule during teething?
No. Dropping a nap or shifting bedtime to cope with a few uncomfortable nights tends to create a longer-lasting problem once the tooth is through. Offer extra comfort, keep the routine identical, and return to normal quickly.
Can I sleep train while my baby is teething?
Most experts suggest waiting until any acute discomfort has passed, since the point of a structured method is consistency and pain undermines that. A few days is usually enough. If you have been postponing for weeks because there is always another tooth, teething is probably not what is driving the problem.