Sleep Regression at 6 Months

Six months is the age where the evidence is best, and what the evidence says is that waking in the night is ordinary rather than a fault. The American Academy of Pediatrics puts it plainly: at this age a good sleeper is a child who wakes frequently but can get herself back to sleep, not one who sleeps ten hours unbroken, and it is normal for a six-month-old to wake in the night and go back to sleep after a few minutes. So a broken six-month night is not proof that something has gone wrong. It is the most common thing in this subject that anybody has bothered to measure.

The word itself, and what is published instead

None of the publishers this site is allowed to stand on uses the word regression. None of them prints the famous list of months, and not one attaches a duration to any of it. What they publish is when skills usually arrive and that frequent night waking at this age is developmentally appropriate — which is a different kind of claim altogether.

The honest reading is that these are developmental phases rather than clinical events, and the six ages are a folk map of when nights commonly get harder. A map is worth having; it is simply not a finding, and nobody should be sold it as one. The regression timeline lays out all six and marks, on each, which column anybody has measured.

Two patterns, not one timetable

The largest study of night waking followed more than 1,200 infants and checked in at 6, 15, 24 and 36 months. It did not find one developmental curve that everybody was on. It found two, and they stayed apart for three years.

About two thirds of the group woke their mothers roughly one night a week, and went on doing that throughout. About a third woke every night at six months, dropped to two nights a week by fifteen months, and were down to one night a week by two years. A slope, not a switch — and never the same slope as the other group.

Read that twice if your baby is in the second group, because it is the sentence the rest of the internet leaves out. Neither pattern is the broken one. If she wakes every night at six months, she is one of a great many babies doing exactly that, and no chart of regression ages was ever going to describe her nights, because the chart was drawn from the other group.

It also means the thing you are measuring yourself against may not exist. The friend whose baby sleeps from seven to seven is not a further-along version of your baby; she is, on this evidence, a different pattern that was there at six months and stayed.

What is genuinely happening at six months

Plenty, and none of it is a regression.

Solids start. Around six months solid food begins to be added alongside milk — the AAP puts the start of solids at about this age. What solids do not do is buy you a night. No publisher this site may cite claims that food in the evening produces a longer stretch of sleep, and anyone who tells you otherwise is guessing with your evening. What solids genuinely add at first is a new thing to digest, a new mess and a new twenty minutes to the day, at exactly the moment your evening has no spare twenty minutes.

Sitting is the project. She is working on getting upright and staying there, all day, and a baby practises a new skill whenever she has nothing else to do — at two in the morning she has nothing else to do. Sitting without support is usually established a couple of months from now; the eight-month page carries the AAP's own line on it, along with what happens when standing follows.

The day is about to change shape. Awake stretches at six to seven months run somewhere around two to three hours, on two or three naps, and the third nap is on its way out for many families somewhere between six and nine months. The wake windows by age guide explains where those bands come from and why they are bands; the six-month wake windows page and the wake window calculator put them against your clock.

Separation anxiety is on its way. It arrives later in the first year and does most of its damage a little further on, which is why the eight-month guide is where this site carries it and its source.

"But she slept better at four months"

This is the sentence people arrive at this page with, and it deserves a straight answer rather than reassurance.

Some of it is real. Sleep at four months had just finished reorganising itself into regular cycles — that is the subject of the four-month page — and a baby who came through that settled can look, for a few weeks, like a solved problem. Then she starts doing something new with her body every fortnight, and a solved problem turns out to have been a quiet month.

Some of it is arithmetic. Awake time has grown by an hour, so a day that fitted her in month four fits her badly in month six, and the mismatch shows up at bedtime and at four in the morning.

And some of it, honestly, is memory. Nights are hard to remember accurately from inside a stretch of broken ones. This is the argument for writing them down: a fortnight of notes is the only version of the last month that is not being edited by exhaustion.

What to do about it

Not much, and deliberately. The response to an ordinary developmental stretch is to hold the parts of the day that cost you nothing and stop rebuilding the ones that do.

Keep the same short order of events before every sleep, in the same room and the same light. Keep nights boring — dim, quiet, minimal conversation, back down. Give her floor time during the day to practise sitting until it is dull, because a skill that is dull in daylight is less interesting at midnight. And expect to settle her more than you did a month ago, which is a response to a change in her rather than a habit you have created.

What to leave alone is the structure. A disrupted fortnight is the worst possible moment to change the number of naps, because you cannot tell whether the change worked while the phase is moving underneath it. If the third nap has genuinely been a fight most days for two weeks, and bedtime is drifting later because of it, that is the three-to-two nap transition — a separate decision with its own signs, and the nap transition checker is as willing to tell you to wait as it is to tell you to change anything.

Safe sleep at the age she can sit up

A baby who can push herself upright changes what the cot needs to be, so it is worth a look now rather than after the first surprise. Babies go down on their back for every sleep, day and night, on a firm flat mattress, in a cot clear of blankets, pillows, bumpers and soft toys, in your room for at least the first six months. Nothing weighted goes on or over a sleeping baby. Nothing new gets added to the cot as a comfort object at this age, and anything she could use to climb — a bumper, a stack of muslins, a toy — comes out.

How long, and when to make a call

Nobody publishes a duration, so nobody can tell you. Parents commonly report a week or two at this age, which is unsourced and offered only for context. What the cohort study can tell you is the longer shape: for about a third of babies, most nights at six months means most nights for a while yet, improving in slow steps rather than on a particular evening.

The things that are worth a phone call are not the timing. Poor feeding, no weight gain, a baby who cannot be settled at all, a cry that does not sound like her usual one, or anything that simply frightens you — those are a conversation with your pediatrician or health visitor. This page is general information, not medical advice, and it cannot see your baby.