If you’ve spent the last few weeks bouncing, feeding and pacing the hallway at 2am, you’ve probably typed some version of “when do babies sleep through the night” into Google more than once. The honest answer is that it varies more than most sleep charts let on, and what counts as “through the night” changes as your baby grows. This guide walks through what’s realistic at each age, why night waking happens, and how sleep regressions and wake windows fit into the picture. Think of it as the companion to our newborn sleep guide, picking up where the very early weeks leave off.
Baby Sleep Patterns by Age: What’s Realistic to Expect
Every baby is different, and comparing your baby’s sleep to a friend’s (or a stranger’s on social media) rarely helps. That said, it helps to know the general shape of things. According to Pregnancy, Birth and Baby, a Healthdirect Australia service, here’s roughly what to expect:
- Birth to 3 months: around 11 to 19 hours of sleep across a 24-hour day, spread over many short stretches. Newborns wake often, partly because their sleep cycle is only about 45 to 60 minutes long (an adult’s is closer to 90 minutes), and partly because their tiny tummies need feeding around the clock.
- 3 to 6 months: around 12 to 15 hours total, and this is usually when the first longer night stretches show up. Some babies can manage 6 to 8 hours straight overnight in this window, though plenty don’t, and that’s still within normal range.
- 6 to 12 months: around 11 to 16 hours, spread across a couple of daytime naps and a longer night sleep. Many babies in this bracket still wake overnight and need help settling back down, often tied to teething, crawling or separation anxiety rather than hunger.
- After 12 months: around 10 to 14 hours, usually with one daytime nap.
If your baby doesn’t match this exactly, that’s normal too. These are averages, not a scoreboard.
Why Babies Wake at Night (And Why It’s Not Something You’re Doing Wrong)
Night waking is one of the most normal parts of early parenthood, even though it doesn’t always feel that way at 3am. A few common reasons:
- Hunger and growth spurts. Small stomachs empty quickly, and growth spurts can temporarily increase how often your baby wants to feed, including overnight.
- Discomfort. Teething, a wet nappy, reflux, or being too hot or cold can all interrupt sleep.
- Day-night confusion. Newborns don’t yet have a strong body clock. Pregnancy, Birth and Baby notes that babies typically start developing a circadian rhythm and responding to light and dark from around 4 to 6 weeks old, before which sleep is driven mostly by hunger rather than time of day.
- Sleep associations. If your baby always falls asleep being fed or rocked, they may look for the same thing when they stir between sleep cycles overnight. This isn’t a habit you’ve created wrong, it’s just how sleep associations work for most babies at some point.
None of this means anything has gone wrong. It’s part of how babies develop, and most of it resolves on its own with time.
Understanding Sleep Regressions
If your baby was sleeping reasonably well and then suddenly isn’t, you may be dealing with a sleep regression rather than a step backward. A regression is a temporary stretch of disrupted sleep that tends to line up with a developmental leap, physical changes like learning to roll, sit, crawl or pull up to standing, or emotional changes like separation anxiety.
You’ll often hear regressions grouped loosely around four months, and then again later in the first year and into toddlerhood as babies master new physical skills and become more aware of you leaving the room. The exact timing varies a lot between babies, so don’t worry if yours doesn’t line up neatly with what you read online.
The good news is regressions are temporary. Keeping a consistent bedtime routine through a rough patch, rather than changing everything at once, usually helps things settle again once your baby has mastered whatever new skill or milestone is behind the disruption.
Wake Windows: Why Timing Sleep Matters
A wake window is simply the stretch of time your baby can comfortably stay awake between sleeps. Get it right and settling tends to be easier. Let it run too long and an overtired baby often becomes harder to settle, not easier, and may wake more overnight.
Wake windows are typically short in the newborn weeks, when babies wake roughly every 1 to 3 hours to feed and resettle, and they generally stretch out as your baby grows. As a rough guide, by 6 to 12 months many babies are down to a couple of daytime naps of around 2 to 4 hours combined, and by their first birthday, many are managing on a single 1 to 2 hour nap. These ranges are commonly cited guidelines rather than a fixed rule, and that gradual lengthening is part of why the bedtime that worked at 4 months might be too early, or too late, by 9 months.
Rather than watching the clock exactly, it’s usually more useful to watch your baby. Rubbing eyes, becoming fussy, staring blankly or losing interest in play are all classic tired signs worth acting on before overtiredness sets in.
Breastfeeding, Formula and Night Waking: Sorting Fact From Myth
It’s a common assumption that formula-fed babies sleep through the night sooner because formula takes longer to digest. In practice, how long a baby sleeps overnight depends on a mix of factors, including their individual temperament, weight, development stage and overall health, not just what’s in the bottle or on the breast.
Breastfed and formula-fed babies both wake at night for all the reasons covered above, and plenty of breastfed babies sleep for long stretches early while plenty of formula-fed babies don’t, and vice versa. If you’re breastfeeding and worried about your baby’s feeding or sleep pattern, a lactation consultant, maternal child health nurse or your GP is a better source of tailored advice than a general rule of thumb.
Gentle Ways to Help Your Baby Settle at Night
There’s no single trick that works for every baby, but a few gentle, well-supported habits tend to help most families:
- A simple, consistent bedtime routine. Something like bath, feed, story, cot, in the same order most nights, helps signal to your baby that sleep is coming.
- Adjusting feeding times. Offering a full feed before bed, and making sure daytime feeds aren’t too spaced out, can reduce how often your baby wakes purely from hunger.
- A calm, comfortable sleep environment. Keeping the room at a steady temperature and cutting down on background noise and light helps some babies settle more easily. Plenty of families find a dedicated baby white noise machine useful for masking household noise once everyone else is still awake.
- Self-soothing, introduced gradually. As your baby gets a little older, giving them a moment to settle themselves before you step in, rather than reaching for them at the very first sound, can help them build the skill of falling back asleep on their own.
If you’re considering a more structured sleep training approach, it’s worth having a chat with your GP or child health nurse first, both to make sure it’s the right fit for your baby’s age and temperament, and to get guidance suited to your specific situation rather than a one-size-fits-all method.
Room-Sharing and Safe Sleep: What You Need to Know
Room-sharing, having your baby sleep in their own cot in your room rather than in a separate nursery, is different from bed-sharing, and it’s specifically recommended as the safer option. Pregnancy, Birth and Baby (Healthdirect Australia) advises keeping your baby in a safe cot in the same room as you for the first 6 to 12 months.
A few safe sleep basics worth keeping front of mind:
- Always place your baby on their back to sleep, not on their tummy or side.
- Use a firm, flat mattress with no soft toys, cot bumpers or loose bedding.
- Keep your baby’s face and head uncovered, and dress them for the room temperature rather than piling on blankets. A well-fitted baby sleeping bag is a popular way to manage this without loose bedding in the cot.
- Keep the home smoke-free, and breastfeed if you’re able to. According to Red Nose Australia, both are associated with a reduced risk of sudden unexpected death in infancy (SUDI).
For the full safe sleep checklist, Red Nose Australia is the go-to Australian authority on reducing SIDS and SUDI risk, and it’s worth bookmarking alongside this guide.
When to Talk to Your GP About Your Baby’s Sleep
Most disrupted sleep is developmentally normal, but there are times it’s worth raising with your GP or maternal child health nurse rather than waiting it out:
- Loud snoring, gasping or pauses in breathing during sleep
- Sleep that isn’t improving at all over several months despite a consistent routine
- Feeding or weight gain concerns alongside the sleep disruption
- You’re feeling exhausted to the point it’s affecting your own physical or mental health
None of this is about diagnosing what’s going on yourself. It’s simply knowing when a second opinion is worth getting, so you’re not carrying it alone.
Common Questions
What does it mean for a baby to “sleep through the night”?
In most parenting and health resources, “sleeping through the night” doesn’t mean 12 hours of unbroken sleep from bedtime to morning. It usually refers to a longer stretch, often 5 to 8 hours, without needing a feed or a full resettle. Babies still cycle through lighter and deeper sleep during that stretch, and some brief stirring is completely normal.
When do babies sleep through the night?
There’s no single age that applies to every baby, but many families start seeing longer overnight stretches, sometimes 6 to 8 hours, from around 3 to 6 months, according to Pregnancy, Birth and Baby. Plenty of babies take longer than this, and that’s still within the range of normal.
Why does my baby keep waking up at night?
The most common reasons are hunger, discomfort (like teething or a wet nappy), an immature body clock, and sleep associations such as needing to be fed or rocked back to sleep. Growth spurts and developmental leaps, including sleep regressions, can also bring back night waking in a baby who was previously sleeping well. It’s rarely a sign you’re doing anything wrong.
Do breastfed babies sleep through the night later than formula-fed babies?
Not necessarily. While it’s a common assumption, how long a baby sleeps overnight depends far more on their individual development, temperament and health than on whether they’re breastfed or formula-fed. Both breastfed and formula-fed babies wake at night for the same range of normal reasons.
Is it safe to room-share with my baby, and for how long?
Yes, room-sharing, keeping your baby in their own cot in your room rather than a separate nursery, is recommended as safer than bed-sharing. Pregnancy, Birth and Baby advises room-sharing in a safe cot for the first 6 to 12 months of your baby’s life.
When should I talk to a doctor about my baby’s sleep?
It’s worth checking in with your GP or maternal child health nurse if you notice snoring, gasping or breathing pauses during sleep, if sleep isn’t improving despite a consistent routine over several months, or if there are feeding or weight gain concerns alongside the sleep issues. It’s also worth reaching out if the exhaustion is taking a toll on your own wellbeing.
Conclusion
Sleep in the first year rarely follows a straight line, and most of what feels like a setback (a 4am wake-up, a regression, a wake window that suddenly feels wrong) is just your baby’s development doing exactly what it’s supposed to do. Knowing when do babies sleep through the night in realistic terms, rather than the tidy version some sleep charts promise, makes the 2am wake-ups easier to sit with. Pair this guide with our newborn sleep guide for the very early weeks, keep the safe sleep basics front of mind, and lean on your GP or maternal child health nurse whenever something doesn’t feel right. You know your baby better than any chart does.
