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Baby Sleep Patterns by Age: How to Read Them Before You Try to Fix Them

Total sleep, nap counts and wake windows at every age, why the averages mislead, and how two weeks of your own logs beat any generic sleep chart.

| 10 min read | By the LittleLog team

Illustration of a baby sleeping peacefully in a crib beneath a crescent moon, with a soft sleep rhythm chart in the background.

Most sleep advice starts with what to change. That is the wrong first step. Before you pick a method, you need two weeks of honest data about what your baby is already doing, because almost every "problem" turns out to be either a normal developmental stage or a wake window that is 20 minutes off.

Sleep totals and naps by age

  • 0 to 3 months: 14 to 17 hours per 24, split into 2 to 4 hour chunks around the clock. No day and night rhythm yet, because circadian rhythm and melatonin production are still developing. Naps: 4 to 6, wildly variable.
  • 3 to 4 months: 12 to 16 hours. Nights start to consolidate, and sleep cycles mature, which is what people call the four month regression. Naps: 3 to 4. Wake windows: 1 to 2 hours.
  • 4 to 6 months: 12 to 16 hours, with 9 to 11 at night. Naps: 3, gradually more predictable. Wake windows: 2 to 2.5 hours.
  • 6 to 9 months: 12 to 15 hours. The third nap starts dropping. Naps: 2 to 3. Wake windows: 2.5 to 3 hours.
  • 9 to 12 months: 12 to 15 hours, with 10 to 12 at night. Naps: 2. Wake windows: 3 to 4 hours. Separation anxiety and new motor skills often cause a temporary wobble.
  • 12 to 18 months: 11 to 14 hours. The two-to-one nap transition, usually messy for several weeks.

Why the averages mislead

A 14 hour baby and a 17 hour baby are both normal, and the difference is nearly 20 percent of the day. Published sleep ranges come from population studies, so the middle of the range describes a crowd, not your child. The number that actually helps is your own baby's fourteen-day average, because when it moves, something real changed.

Reference ranges worth reading: the Sleep Foundation duration recommendations and AAP HealthyChildren sleep pages. For safe sleep specifically, follow the NICHD Safe to Sleep guidance.

Wake windows beat clock schedules

Under about six months, time awake predicts sleep better than time of day. Too short a wake window produces a 25 minute nap and a fight at the next one. Too long produces an overtired, hard-to-settle baby who wakes 40 minutes into the night. Both look like the same problem from the outside, and the log tells them apart.

Practical method: log every sleep start and end for two weeks, then compare the wake window immediately before each nap to that nap's length. A pattern usually appears fast. Naps after a 95 minute window run an hour, naps after 130 minutes collapse to 30 minutes, and now you have your baby's number rather than the internet's.

Four sleep patterns worth recognising

  • Cycle-boundary waking: waking at consistent 35 to 45 minute intervals in naps. Developmental, not a sleep-training failure.
  • Split nights: an hour or two of cheerful wakefulness in the middle of the night, often when total daytime sleep has crept up.
  • Early rising: waking before 6am, frequently linked to a too-long last wake window or a bedtime that drifted late.
  • Regression that is not a regression: same total sleep, more pieces. Weekly stats show this instantly, while a single bad night tells you nothing.

Turning logs into decisions

Track sleep starts and ends for fourteen days. Then look at four things: total sleep per 24 hours, longest night stretch, number of naps, and average wake window. Change one variable at a time, wait five days, then compare the same four numbers. That is a real experiment, and it beats trying a new method every third night.

LittleLog is built for exactly this loop: a running nap timer you start with one tap, a timeline that puts sleep beside feeds and diapers so you can see the interaction, and weekly stats that make a trend obvious. Premium adds sleep trend analysis and a next-nap estimate from your baby's own history. Pair it with the feeding schedule guide since feeding and sleep are the same puzzle from two angles.

Frequently asked questions

How much should a baby sleep by age?

Rough 24-hour totals: 14 to 17 hours for newborns, 12 to 16 hours from 4 to 12 months including naps, and 11 to 14 hours from 1 to 2 years. The spread between healthy babies is wide, so trends matter more than hitting a number.

What are wake windows by age?

Typical awake time between sleeps: 45 to 60 minutes for newborns, 1 to 2 hours at 3 to 4 months, 2 to 3 hours at 6 months, and 3 to 4 hours near 12 months. Your baby's own logged average matters more than the chart.

When do babies start sleeping through the night?

Many babies manage a 6 to 8 hour stretch somewhere between 3 and 6 months, but plenty do not, and night waking beyond a year is still within normal. Look for a lengthening longest stretch over weeks rather than a single perfect night.

Is the 4 month sleep regression real?

Around 3 to 4 months infant sleep architecture matures into more adult-like cycles, so brief wakings between cycles become more noticeable. In logs it usually shows up as the same total sleep broken into more pieces.

How many naps should my baby take?

Newborns nap unpredictably 4 to 6 times a day, most babies settle to 3 naps by 4 to 6 months, drop to 2 naps somewhere between 6 and 9 months, and move to 1 nap between 12 and 18 months. Nap logs show the transition before it feels obvious.

LittleLog is a tracking tool, not medical advice. Speak to your paediatrician about persistent sleep concerns, breathing issues or growth worries.

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