Seven to twelve months
7-12m · Updated 2026-08-25
This is the most orderly stretch of the first two years — enjoy it. The day settles into a shape so common it's almost a uniform: wake around 6–7 a.m., nap near 9, nap near 1, bed between 6 and 8 p.m. By nine months, 91% of babies take exactly two naps. If the first half-year was weather, this is climate.
The nights are the exception, and this article's job is to say so before anything else does.
What changes in this window
- The third nap dies. It goes from 16% of babies at six months to 1% at twelve, usually gone by nine. Its funeral is paid for with an earlier bedtime — when the catnap drops, bed moves earlier, sometimes a lot earlier, and everything else holds. A third nap that persists past nine months is usually a sign the bedtime is too late, not that your baby is special.
- Night feeds end, biologically. By nine months, night feeding is no longer a nutritional need. Wakings that continue past that point are about how sleep restarts, not hunger — which is actually good news, because it means they're solvable without the fridge.
- The afternoon becomes the marathon leg. Once the third nap is gone, the last-nap-to-bedtime stretch is the longest wakeful period of the day — and the one to protect with the earlier bedtime when it sags.
- Feelings arrive at night. Separation anxiety starts around six months and peaks at eight to nine, right on top of the classic 8–10-month regression window and a burst of skill practice (crawling, pulling to stand — sometimes literally in the crib, at 3 a.m., like a tiny determined mountaineer). A settled sleeper who suddenly protests at this age is most often developing, not regressing.
The honest baseline, which is not the published one
You will read that infants this age average about one night waking. That is the pooled reference figure, and I no longer think a parent should be handed it without the sentence that follows.
Those figures come mostly from asking parents, afterwards, how often their baby wakes — and the reviews' own authors flag that parents under-report it, because a waking a child resolves alone is invisible and recall flattens a month of nights into an impression of one. Night waking is the least reliable number in the whole reference set. My own logs, kept in the moment, put this age band at a mean of 3.5 wakings a night, and as many as eight — and this was the peak of the whole two years, higher than the newborn months.
That is not a worse child. It is a different measurement, and it lines up exactly with everything else happening here: separation anxiety peaking, the 8–10-month regression, skills being practised at 3 a.m., the third nap going. Both results, with their workings and their caveats, are in the notebook — the measurement gap and the seven-to-eleven-month peak.
Two things follow. If you track honestly and your number looks nothing like "one", compare logs to logs and not logs to memories. And if this is the hardest stretch of nights you have had, that is because for one real child it measurably was — a hump with a far side, not a slide.
Night totals carry the mirror-image of the same problem: the published ~11 hours is time in bed, while NaniNani subtracts every waking you log. On my own nights the time in bed matched the reference almost exactly and the figure after subtraction read about an hour lower — for the identical child, on the identical night. The hour is bookkeeping, not lost sleep.
The stable two-nap day is the pattern. It was never a promise of silence.
Two Weissbluth red flags worth knowing, because they point at the schedule rather than the child: still three naps well past nine months, or down to one nap well before twelve — both usually mean the timing frame needs adjusting, and the first lever to pull is always bedtime, earlier, in 20-minute steps.
What the app does at this age
This is the era NaniNani's forecast likes best: two stable nap positions to learn, a clear bedtime anchor, and enough regularity that the tide's shape repeats day to day. Expect the most confident water of the whole first year. When it wobbles anyway, check the calendar before the settings — an 8–10-month wobble is usually a milestone with a start and an end, and the app's job is to keep saying so: this is development, on schedule, passing through.
Where this comes from
- Marc Weissbluth, Healthy Sleep Habits, Happy Child (4th ed.). Read in full; wake-window rules, turning points of sleep maturation, second-wind physiology.
- Alexis Dubief, Precious Little Sleep. Read in full; wake-time tables, the sleep-drive balloon, nap-transition mechanics.
- Barbara Galland, Barry Taylor, Dawn Elder & Peter Herbison, "Normal sleep patterns in infants and children: a systematic review of observational studies", Sleep Medicine Reviews 16:213–222 (2012). Pooled reference values: sleep duration, night wakings, latency, longest sleep period by age band.
- My own dataset: 671 days, 2,181 hand-logged sleep sessions of one child, month 1 to month 22, used to fit and validate the engine. The honest scorecard, losses included, is in the notebook.