Baby Sleep Schedule & Wake Windows by Age
Enter your baby's age in months and get recommended total sleep per day, a typical nap count, and how long they can comfortably stay awake at this stage.
Quick samples
Enter an age to see sleep and wake-window guidance.
Add your baby’s age in months (0–36), or try a quick sample, and typical sleep totals and wake windows appear here.
Ranges are typical, taken from published pediatric sleep recommendations. Every baby varies, and a single short or long day is normal — watch the pattern over a week.
The formula
Recommended sleep = age-band total (24h) · naps = age-band count · wake window = age-band awake range
- Total sleep — How much sleep in twenty-four hours, night plus naps combined, is recommended for the age.
- Naps — How many daytime sleeps babies of this age typically take.
- Wake window — How long a baby of this age can comfortably stay awake between sleeps.
- Age band — A stage such as 4–6 months, since sleep needs change by ranges rather than exact days.
Sleep and wake windows by age band
| Age | Total sleep / 24h | Naps | Wake window |
|---|---|---|---|
| 0–3 months | 14–17 hours | 4–6 | 45–90 min |
| 4–6 months | 12–16 hours | 3–4 | 1.5–2.5 hours |
| 7–12 months | 12–15 hours | 2–3 | 2–3.5 hours |
| 1–3 years | 10–14 hours | 1–2 | 3.5–6 hours |
Typical published ranges; individual needs vary. The calculator uses finer bands than this summary table.
Newborn sleep and older-baby sleep look almost nothing alike, so a single bedtime rule cannot fit every age. This calculator gives you the figures that do change month by month: recommended total sleep across twenty-four hours, a typical nap count, and the length of time a baby this age can comfortably stay awake — the wake window.
Enter your baby's age in months, from newborn to three years, and you get those three numbers for their current stage, drawn from published pediatric sleep recommendations. It is a quick way to sanity-check whether your days look typical.
Wake windows in particular are the most practical thing parents act on. Read your baby's age band here, then watch for the sleepy cues that appear near the end of that window, and you can time naps to avoid the overtired crash rather than following a fixed clock.
How sleep needs change by age
Newborns sleep a great deal — roughly fourteen to seventeen hours across the day and night — but in short, scattered stretches, because they cannot stay awake long before needing to sleep again.
As babies grow, total sleep drifts gently downward while night sleep lengthens and daytime naps consolidate into fewer, more predictable blocks. By six to nine months many babies have settled onto two or three planned naps.
Somewhere between the first and second birthday the third nap drops, one longer nap becomes the norm, and total sleep settles around eleven to fourteen hours, mostly at night. The wake window, meanwhile, keeps lengthening all the way through toddlerhood.
What a wake window actually is
A wake window is the amount of time a baby can comfortably stay awake between sleeps. Newborns manage only forty-five to ninety minutes, while an eighteen-month-old can hold out three to four hours before needing a nap.
The idea comes from how sleep pressure builds: stay awake too long and a tired baby releases stress hormones that make settling harder, so an overtired child is often more wakeful, not sleepier.
That is why the number is a guide to timing rather than a race. Watch your baby's own sleepy cues — eye rubbing, wandering attention, fussiness — as the window nears its end, and offer sleep then instead of waiting for the clock or a fixed schedule.
A worked example
A mother of a five-month-old enters five and gets roughly twelve to sixteen total hours, three to four naps, and a wake window of about one and a half to two and a half hours.
She reads that as: after each nap her baby can comfortably stay awake around two hours before the next sleep is due, with the last stretch of the day a touch longer before bedtime.
Six months on, at eleven months, the same tool shows two naps and a wake window nearer three to three and a half hours, so the shape of her day changes without any fixed clock time being the cause.
How to use this calculator well
Treat the numbers as the middle of a normal range. Some healthy babies sit comfortably at the low end of total sleep and some at the high end, and neither is a problem if growth and mood are fine.
Use the wake window as the practical lever. Adjusting nap timing to your baby's age-appropriate window does more for the day than trying to force a particular bedtime or a rigid every-three-hours routine.
Recheck the figures as your baby grows. Sleep needs move fast in the first year, so a schedule that worked at four months often needs nudging again by six or seven.
- Anchor the day on the first wake window after the morning wake, which is usually the shortest.
- Let the final wake window before night sleep be the longest of the day.
- If a baby fights a nap, check both too-tired and not-yet-tired before changing the schedule.
When to speak to your provider
Occasional rough nights are ordinary and are not what this guidance is about. Reach out to your health visitor or paediatrician about sleep that persistently seems far outside these ranges, or that comes with poor feeding, poor weight gain or unusual fussiness.
Snoring, pauses in breathing, or a baby who is very hard to settle every day are worth mentioning rather than managing alone, as they occasionally point to something that needs checking.
For safety, always follow safe-sleep guidance for your baby's age — back to sleep, a flat firm surface, and nothing loose in the crib — and ask your provider before adding pillows, bedding or a transitional object.
Wake windows and sleepy cues in practice
The most useful way to spend the figures above is on the timing of the day rather than the clock. A day is really a sequence of wake windows and naps: your baby wakes, stays awake for roughly their age-appropriate window, then sleeps again, and that rhythm repeats until night.
Because the window lengthens as your baby grows, the shape of a good day changes without you having to move any fixed bedtime. A newborn might manage an hour awake, a four-month-old a little under two, and a toddler three or four hours before an afternoon nap.
Read the sleepy cues that appear near the end of a window — drooping eyelids, eye rubbing, a wandering gaze, a sudden fretfulness — as your signal to start a settle. Catching them just before the overtired crash does more for naps than any precise schedule.
- Anchor the morning on the first, usually shortest, wake window after the day's first wake.
- Let the last window before night sleep be the longest, so your baby is properly tired at bedtime.
- Do not wake a normally happy baby purely to protect a schedule; watch cues as well as the clock.
Key terms
- Wake window
- How long a baby can comfortably stay awake between sleeps at a given age.
- Total sleep
- All sleep in a twenty-four-hour period, night plus naps combined.
- Sleep pressure
- The build-up of the drive to sleep the longer you are awake, which wake windows respect.
- Overtired
- Past the comfortable wake window, when stress hormones make settling harder, not easier.
Pro tips
- Use the wake window to time naps, and read sleepy cues near its end.
- Keep the last window before night sleep the longest of the day.
- Recheck the numbers every few weeks — the first year changes fast.
Common mistakes
- Holding a baby to a fixed clock schedule instead of their age-appropriate window.
- Chasing the top of a range when your baby is genuinely a low-sleep-but-happy child.
- Waiting until a baby is fully overtired to start a nap.
- Changing the whole routine after one bad day rather than a pattern.
Baby sleep schedule — your questions
How much sleep does my baby actually need?
It depends on age. Newborns need about fourteen to seventeen hours spread across day and night, that total eases through infancy to roughly twelve to fifteen by six to nine months, and by the toddler years it settles near eleven to fourteen hours, mostly at night. This calculator gives the range for your baby's exact age band, so you can see whether your pattern looks typical rather than following a rule that only fits one stage.
What are wake windows and why do they matter?
A wake window is how long your baby can comfortably stay awake before needing to sleep — as little as forty-five minutes for a newborn and several hours for a toddler. They matter because sleep pressure builds while awake: put a baby down too early and they are not tired, too late and they become overtired and release stress hormones that make settling harder. Timing naps to the end of the right window avoids both, which is why it is the most useful number parents act on each day.
My baby is not on these numbers — is that a problem?
Not usually. These are typical ranges, and healthy babies genuinely spread across them; some are content at the low end of total sleep and some at the high end. What matters is your baby's mood, feeding and growth rather than matching a chart exactly. A one-off short day is normal too. If your baby consistently sleeps far outside the range alongside poor feeding, poor weight gain or unusual distress, that is worth raising with your health visitor or paediatrician.
How many naps should my baby be taking?
Nap counts fall as wake windows lengthen. Newborns doze many short times across the day, babies around six months often take three naps, by nine to twelve months many are on two, and between the first and second birthday they consolidate to a single long midday nap. The exact age each transition happens varies; watch for your baby fighting a later nap rather than dropping one on a set birthday.
Does the calculator handle a newborn versus a toddler?
Yes, across zero to thirty-six months. Enter a newborn's age and you get the short-window, many-nap, high-total-sleep pattern; enter a toddler's and you get one nap, a long wake window and a lower sleep total. Because needs change by band rather than by exact day, the tool steps between stages so the advice fits your child's current age, and you can simply recheck as they grow through each transition over the first three years.
How do I know my baby is overtired, not under-tired?
Both can look like fussiness. An overtired baby often seems wired — wide-eyed, jerky, hard to settle — because stress hormones have kicked in. An under-tired baby usually just fights the nap briefly and is genuinely not sleepy yet, often because the wake window was too short. Checking the age-appropriate window here is the quickest way to tell which one you are dealing with.