When Will My Baby Sleep Through the Night?
It might be the most Googled baby sleep question in existence.
And the reason isn't only tiredness. It's the uncertainty that comes with it. The wondering whether this is normal, whether things are getting worse rather than better, whether there's a point on the horizon where nights will start to feel a little more manageable.
So you go looking for an answer. An age. A milestone. Something that tells you when to expect things to settle.
What you usually find is a number that sounds confident. And then you check your baby against it and feel quietly defeated.
"Everyone said six months" - what those timelines actually mean
Six months tends to be the one most often cited. Sometimes it's earlier. Sometimes parents hear that if they can just get the right bedtime routine in place, everything will shift.
The problem isn't that these things are entirely untrue. It's that they're offered with a certainty that doesn't match how sleep actually develops.
Baby sleep doesn't follow a timetable. It doesn't cross a threshold at a particular age and stay there. It's far more fluid than it's made out to be, and many babies move in and out of different patterns depending on what's happening for them developmentally, physically, and emotionally at any given time
When your baby doesn't follow the expected timeline, it's easy to feel like you've missed something. Like there was a step you didn't take, or something you've been doing wrong.
But the timeline was never that reliable in the first place.
"Sleeping through" doesn't mean what most people think it means
Part of the confusion sits in the phrase itself.
Before you had a baby, sleeping through the night probably meant one thing: a full, uninterrupted stretch. Eight hours, perhaps more.
In research terms, it means something quite different. A stretch of around five to six hours is typically how it's defined in studies. That's a very different picture from the one most parents have in mind when they're rocking a very wide awake baby at 3am.
This matters more than it might seem. When two people say their baby is sleeping through, they can be describing completely different nights. The definition is soft, the benchmark keeps shifting, and measuring your baby against it often creates pressure rather than clarity.
What's actually typical at each age
Research looking at infant sleep across the first two years gives us a clearer picture than most parents are ever offered.
At around three months, the average baby wakes just over twice a night, and only around 15 percent are sleeping through. By six months, waking actually increases slightly - averaging around two and a half times a night - which surprises many parents but makes sense given how much is shifting developmentally at that point. Around 30 percent are sleeping through at six months.
At eight months, the picture looks very similar, with just over two wakes a night on average and only around 20 percent sleeping through. By twelve months things start to shift, with an average of one to two wakes and around half of babies sleeping through. Even by eighteen months, around 20 percent of toddlers are still waking at least twice a night.
The point isn't the numbers themselves.It's what they reveal: that waking through the night is normal well into toddlerhood for a significant proportion of children, and there is no single age at which most babies simply stop waking.
If you're in the early months and wondering whether things are meant to look this way, my blog How Much Sleep Does My Baby Need by Age? covers typical sleep needs across the first two years and how to read those averages without turning them into something to worry about.
Night waking isn't a sleep problem - it's how sleep works
There's a way that frequent waking tends to get talked about, as though it's something going wrong that needs to be corrected.
It isn't.
Sleep moves between lighter and deeper stages all through the night. As adults, we come into light sleep several times without registering it, because we have the capacity to settle ourselves back down quickly and quietly. Babies need more support at those lighter points, particularly while their ability to regulate themselves is still developing.
That need for support hasn't been created by anything you've done. It isn't a habit that's got out of hand. It's simply how early sleep works, and it shifts gradually as your baby's nervous system matures.
If nights feel particularly intense right now - frequent waking, unsettled stretches, waking very close together - my blog Is It Normal for My Baby to Wake Every Hour at Night? looks at why even very frequent waking can be developmentally typical, and what tends to help.
Why bedtime isn't the answer you've been told it is
This is where a lot of the advice starts to feel both convincing and confusing.
You'll often be told that if your baby can fall asleep independently at the start of the night, the rest of the night will follow. The idea is that how they fall asleep at bedtime determines how they settle back to sleep during the night.
It sounds logical. It offers something clear to aim for.
But it doesn't hold up in real life.
Babies who fall asleep entirely on their own can still wake very frequently. Babies who are fed or cuddled to sleep can sleep in long stretches. The relationship between bedtime and night waking is far less direct than it's often presented.
What happens in the final few minutes before sleep is only one small part of a much bigger picture. Sleep is shaped by everything that sits underneath it - the balance of sleep pressure across the day, your baby's body clock, what their nervous system has been carrying, and how much settling they need in order to feel safe enough to rest.
Bedtime is not the control panel for the rest of the night.
What's actually shaping your baby's sleep
If you've ever felt like you've done everything right and the nights are still hard, this is often why.
Sleep pressure is one of the biggest factors. How much of it has built across the day directly influences how settled your baby's night sleep is likely to be. The balance between daytime and night-time sleep matters across 24 hours as a whole, not just in the hour before bed.
The body clock plays a significant role too. Your baby's circadian rhythm shapes when sleep feels biologically natural, which is why some evenings feel harder than others and why morning wake times can be tricky to shift. Understanding your baby's body clock is often more useful than chasing a perfect bedtime. My blog What Time Should My Baby Go to Bed? unpacks why there isn't one right answer, and how to find what works for your baby.
Development is always moving. As babies acquire new skills, become more socially aware, and start processing more of the world around them, sleep often becomes lighter and more disrupted for a stretch. It usually settles again - but not always before something new arrives to shift things once more.
And then there is the day itself. The stimulation, the new experiences, the moments where your baby has had to hold themselves together. Bedtime is often the first real pause in the day, and it can be the point where everything starts to catch up with them. When that happens, it can look like a sleep problem when it's actually just a reflection of how full the day has been.
So when do babies actually sleep through?
There isn't a specific age. And that isn't a cop-out answer.
Sleep development is shaped by far more than how old a baby is. Every baby is different, every nervous system develops at its own pace, and the circumstances around sleep are always changing.
It doesn't happen in one clear moment.It tends to build gradually. The first stretch of the night gets a little longer. The number of wakes reduces. Nights start to feel marginally more settled. Then something shifts - a developmental period, an illness, a change in routine - and things feel unsettled again for a while before settling once more.
It moves forward in pieces rather than all at once.
And even when babies are capable of sleeping through, it doesn't mean they always will. Just like adults, babies can wake because something doesn't feel quite right, because they're uncomfortable, or because they need a moment of reassurance before they can settle again.
Sleep doesn't become fixed at some magic age. It continues to shift.
If you're in the thick of it right now
Wanting more sleep is completely understandable, especially when the nights feel relentless.
But focusing on when your baby will sleep through can put the pressure in the wrong place - as though there's a milestone to reach rather than a pattern that's gradually developing in its own time.
What often helps more is understanding the whole picture: what's driving the waking, what's supporting or undermining your baby's rhythm, and what's within your control and what isn't.
Sleep does change. It won't always feel like this.
If you'd like to start making sense of it, my free resources are a good place to begin. They're designed to help you feel calmer and clearer about what's going on with your baby's sleep, without pressure to fix or change anything immediately.
If you'd like a more structured way to understand your baby's patterns over time, the Baby Sleep Builder was designed to help you make sense of the bigger picture - what's typical, what's influencing your nights, and where there might be small things to support.
Frequently Asked Questions
When do most babies sleep through the night?
Research suggests that around half of babies are sleeping through by twelve months, but this depends heavily on how "sleeping through" is defined. In most studies, it means a stretch of around five to six hours, not a full uninterrupted night. Many children continue to wake regularly well beyond twelve months, and this is within the normal range of development.
Is it normal for my baby to still wake at 12 months?
Yes. Around half of twelve-month-olds are still waking at night. By eighteen months, around one in five toddlers are waking at least twice. Night waking at this age is not a sign that something has gone wrong, or that there is a problem to fix.
Does how my baby falls asleep at bedtime affect night waking?
Not as directly as you may have been told. Babies who fall asleep with support can still sleep in long stretches, and babies who fall asleep independently can still wake frequently. Bedtime is one small part of a bigger picture that includes sleep pressure, body clock timing, development, and nervous system regulation.
What does "sleeping through the night" actually mean?
In research, it typically refers to a stretch of five to six hours without waking. This is quite different from the eight or nine hours most parents have in mind. The definition varies significantly, which is why comparing babies can be so misleading.
How can I support my baby's sleep without sleep training?
Understanding the whole picture of your baby's sleep is usually the most useful starting point. Looking at total sleep across 24 hours, supporting a gentle rhythm to anchor the body clock, and reducing pressure around individual nights can all make a meaningful difference - without any formal sleep training.
