Baby sleep schedules by age

Reading a schedule without letting it read you

There is a particular kind of misery that comes from a printed schedule stuck to a fridge. It starts as reassurance and slowly turns into an examiner. By week three you are not looking at your baby, you are looking at the clock and then at your baby and then feeling something unpleasant about the difference. I did an enormous amount of searching in my daughter’s first months and the thing nobody told me is that the searching itself becomes the problem — ten schedules from ten sites, all slightly different, all delivered with total confidence.

The way out of that is to know what a schedule is actually claiming. It claims that a baby of roughly this age typically sleeps roughly this much in a day, distributed roughly like this. All three roughlys are doing real work. The AASM range for a six-month-old is twelve to sixteen hours in twenty-four — that is a four-hour spread, and it is a range published precisely because healthy babies vary that much. A baby at the bottom of the range and a baby at the top are both entirely normal, and no chart can tell you which one yours is. Only watching her can.

What a schedule is genuinely good for is shape. It tells you that three naps at six months is ordinary and one nap at six months is not; that a 4pm nap tends to eat into bedtime; that the stretch before bed is usually the longest of the day. Those structural facts hold up across babies far better than any specific clock time does. Use the shape. Ignore the precision.

The two things that determine everything else

If you strip a baby sleep schedule down to its load-bearing parts, almost everything falls out of two numbers: the morning wake time and the nap count. Get those right and the rest of the day arranges itself around them.

Morning wake time is the anchor because it is the only fixed point you did not choose. Everything downstream shifts with it. This is why a schedule that specifies “first nap at 9:30” breaks so quickly: on a 5:50 morning, 9:30 is nearly four hours of wake time for a baby who can handle two, and you have an overtired disaster before the mail arrives. Anchoring on the wake time instead — first nap after this many minutes awake — is what makes a schedule survive contact with a real week.

Nap count is the other lever, and it is the one that changes as your baby grows. Four naps become three, three become two, two eventually become one. Each of those transitions temporarily wrecks the day, and each one is easy to attempt too early because the signals that precede a genuine transition are identical to the signals of a rough fortnight. That is a big enough subject to have its own section, including a checker for whether the published signals are actually pointing that way.

Where the schedule tends to break, by age

Some of these are famous. Some are not, and the unfamous ones are harder because you assume you are doing something wrong.

Weeks 0 to 8. There is no schedule and there is not supposed to be one. Circadian rhythm is barely established, day and night are genuinely scrambled, and wake windows are so short — often 35 to 60 minutes — that the whole day is a blur of feed, brief alertness, sleep. Chasing a schedule here mostly produces frustration. Feeding on demand and getting daylight in the morning does more.

Months 3 to 5. The 30-minute nap arrives and it is maddening. Sleep cycles mature around this age, which means babies start surfacing between cycles the way adults do, and many of them cannot yet get back down. This is developmental, not a failure of technique, and it resolves for most babies without intervention.

Months 6 to 9. The schedule finally looks like a schedule — two or three predictable naps, a real bedtime — and then crawling and separation anxiety arrive and take it apart. A baby who has just learned to move will practise at 2am. This is temporary and, annoyingly, the fix is mostly patience.

Months 10 to 14. The long false alarm. Babies here frequently refuse the second nap for a week or two, everybody concludes it is time to drop to one, and the drop is usually too early. Most babies are closer to 14 to 18 months for the 2-to-1 transition than to 12. Refusing a nap at 11 months is more often a leap than a milestone.

How your baby’s totals compare to the published range

If you want to sanity-check a whole day rather than a single nap, add up a normal 24 hours and see where it lands. To be explicit about what this does: it compares your number to a published range. It is not a percentile, and it does not rank your baby against other babies, because we have no data on other babies and would not use it this way if we did.