Wake windows by age: full chart from newborn to toddler

A wake window is the stretch of time your baby can comfortably stay awake between sleeps before tipping into overtired. It adapts to the day you actually had - a 5 a.m. start, a short first nap, a skipped feed - in a way a fixed clock schedule never can.

The catch: wake windows change fast in the first year. What fits a 3-month-old is wrong by 5 months. That is why a window-based approach beats clock-watching, and why the schedule from the book stops working every few weeks.

Wake windows by age (chart)

These are typical ranges, not strict rules. Use the lower end after a rough night or a skipped feed, the upper end after a solid morning. The last window before bedtime is intentionally longer than mid-day windows.

• Newborn (0-6 weeks): 45-60 min, 4-6+ naps. Watch cues over the clock.
• 7-12 weeks: 60-90 min, 4-5 naps. First rhythm appears.
• 3-4 months: 75-120 min, 3-4 naps. The 4-month regression hits here.
• 5-6 months: 2-2.5 hours, 3 naps. Naps start to consolidate.
• 7-9 months: 2.5-3 hours, 2 naps. The 3-to-2 nap transition.
• 10-12 months: 3-4 hours, 2 naps. Some drop to 1 nap late.
• 13-18 months: 4-5 hours, 1 nap. The 2-to-1 transition.
• 18 months to 3 years: 5-6 hours, 1 nap. The last nap holds longest.

To calculate this for your exact age and morning wake time, the Baby Soma Wake Window Calculator uses the same age table the app runs on.

Overtired vs undertired: reading the window

Both ends of the window look similar at bedtime - a baby who will not settle - so the signal is in how they fight it.

• Window too long (overtired): a sudden second wind, wired or giddy, arching, crying at lights-out, falling asleep then waking 45 minutes later.
• Window too short (undertired): calm but wide awake, taking 30+ minutes to drift off, then a short nap because there was no sleep pressure yet.

The reliable move is to combine the window with your baby cues. Tired signs that are early differ from signs that mean the window already closed.

How to use the window instead of the clock

• Note the morning wake time. It anchors the whole day.
• Add the age-appropriate window. That is the first nap start.
• After each nap, start a new window. Adjust by 10-15 minutes based on nap quality - a short nap means a slightly shorter next window.
• Use the longer last window before bedtime so your baby is tired-enough, not exhausted.

When the chart is wrong for your baby

The table is a population range, not a prescription. Some babies sit at the bottom from birth (low sleep need, intense temperament), some at the top. A 2-3 week stretch where everything is off is usually a growth spurt or a regression, not a permanent shift.

If you are fighting the range every single day for two weeks, follow your baby, not the chart. The window is a starting point on day one, not an override for what your specific baby shows you on day fifteen.

FAQ

What are wake windows by age?

The comfortable awake time between sleeps, growing from about 45-60 minutes for a newborn to 5-6 hours for a toddler on one nap. The ranges above are typical, not strict.

Why is the last wake window longer?

The final window before bedtime needs more sleep pressure so the baby falls asleep promptly and holds the first stretch of the night. Mid-day windows are shorter because there is a nap on the other side.

My baby wake window does not match the chart.

A 15-20 minute difference is normal. If the gap is larger and persistent for over two weeks, your baby is simply at one end of the range. Shift everything consistently and follow them.

Are wake windows medical advice?

No. They are educational ranges based on pediatric sleep research and the Baby Soma reference table, not a diagnosis. Talk to a pediatrician for any medical concern.

Related guides

Keep reading: Wake windows around 6 months: numbers, signals and a sample day, Baby sleep schedule by age: quick guide from newborn to age 3. Calculate it for your baby with the Wake Window Calculator.