The question every exhausted new mom is googling at 3am: when do babies start sleeping through the night? The short answer is that most babies get there between 4 and 6 months — but the full answer is a lot more nuanced than that. Here’s what the research actually says, what’s realistic to expect month by month, and the sleep tips that genuinely make a difference.
1. What “Sleeping Through the Night” Means for Babies
First, a reality check. “Sleeping through the night” doesn’t mean 10 uninterrupted hours. It typically means a child has slept for at least 6 uninterrupted hours without calling out. For most pediatricians and sleep experts, 6 to 8 hours of consecutive sleep counts as sleeping through the night for a baby.
Here’s something else worth knowing: no one — babies nor adults — truly sleeps through the night. We all wake between sleep cycles throughout the night. The difference between babies and adults is that adults know how to fall back to sleep on their own. Teaching your baby that skill is really what sleep training is all about.
2. When Do Babies Start Sleeping Through the Night? A Month-by-Month Timeline
Newborn — 0 to 3 Months
Newborns need to eat every 2–3 hours, including at night. Their stomachs are tiny and they simply can’t go long without feeding. Babies sleep 11 to 17 hours a day in their first year — but this sleep is spread out into smaller chunks throughout the day and night, especially during the first few months. Don’t try to sleep train at this stage. Focus on survival, feeding on demand, and keeping a safe sleep environment.
3 to 4 Months
When your baby is around 4 months, their circadian rhythm is forming and they naturally will start to be able to sleep longer stretches at night. Most babies start sleeping through the night — about 6 to 8 hours — without waking up when they’re between 3 and 4 months old, or when they weigh about 12 to 13 pounds. This is also when many parents start thinking about sleep training.
What Is the 4-Month Sleep Regression? Around 4 months, many babies who were starting to sleep longer suddenly wake more frequently again. This happens because their sleep cycles are maturing. It’s normal — and it usually passes within 2–6 weeks.
4 to 6 Months
This is the sweet spot for most families. Most babies sleep through the night around 6 months. In one study, about 38% of 6-month-olds were not sleeping through the night, but that number dropped to less than 28% by 12 months. By 6 months, most babies can go 6–8 hours without a feeding, making this the most common age to begin formal sleep training if needed.
6 to 9 Months
Somewhere between 5 and 9 months of age, babies may start sleeping through the night. Night weaning often happens naturally during this period. Teething can cause setbacks — if your baby was sleeping well and suddenly isn’t, a new tooth is often the culprit.
9 to 12 Months
By this age, the vast majority of babies are capable of sleeping through the night. Remember that every child grows and develops at their own pace, so it’s okay if yours isn’t sleeping through the night yet at 8 or 9 months. Separation anxiety peaks around 9 months and can cause new night wakings even in babies who were previously sleeping well.
3. Baby Sleep Training Methods: What Are Your Options?
Sleep training is the process of teaching your baby how to fall asleep on their own. There are several approaches, and the best one is the one your family can actually follow consistently. Here’s a quick overview:
Cry It Out (Extinction Method)
You put your baby down awake and don’t return until morning. It’s one of the most researched methods and research consistently shows it is safe and effective. It’s also the hardest emotionally for parents. Most babies adjust within 3–5 nights.
Ferber Method (Graduated Extinction)
You put your baby down awake, then return at gradually increasing intervals to briefly reassure them without picking them up. Start with 3 minutes, then 5, then 10. This gives parents a more active role while still teaching independent sleep. Most families see results within one to two weeks.
Chair Method (Sleep Lady Shuffle)
You sit in a chair next to the crib and gradually move the chair farther from the crib every few nights until you’re out of the room entirely. Slower than other methods but gentler for parents who struggle with any amount of crying.
No-Cry Methods
Techniques like the Pick Up/Put Down method or fading involve gradually reducing your involvement in helping your baby fall asleep without any crying. These take longer — often several weeks — but suit families who aren’t comfortable with any form of cry-it-out.
Pediatrician Note: The American Academy of Pediatrics (AAP) supports behavioral sleep training methods as safe and effective for healthy babies 4 months and older. No method has been shown to cause harm when done appropriately.
4. Tips That Actually Help Babies Start Sleeping Through the Night
Regardless of which method you choose, these foundations make the biggest difference:
- Put your baby down drowsy but awake. This is the single most important habit. If your baby always falls asleep while feeding or being rocked, they won’t know how to fall back asleep independently when they wake between sleep cycles at night.
- Establish a consistent bedtime routine. Bath, massage, feeding, book, song, crib — in the same order every night. Babies thrive on predictability. A consistent routine signals that sleep is coming.
- Keep bedtime early. Overtired babies fight sleep harder. Most babies do best with a bedtime between 6:30 and 8pm. “Sleep begets sleep” — an earlier bedtime often means better night sleep, not less of it.
- Use a white noise machine. It masks household sounds that cause startling and mimics the sounds of the womb. Many families say this alone made a noticeable difference. You can shop popular white noise machines for babies on Amazon to find the right fit for your nursery.
- Make the room dark. Use blackout curtains. Light is one of the strongest signals to the brain that it’s time to be awake.
- Watch wake windows. An overtired baby is harder to settle. Track how long your baby has been awake between naps and aim for age-appropriate wake windows.
- Be consistent. Whatever approach you choose, consistency over several nights is what makes it work. Mixed signals — some nights responding, other nights not — confuse babies and extend the process.
5. Babies Start Sleeping Through the Night: Age-by-Age Guide
- Newborn (0–3 months): 14–17 hours total, every 2–3 hours. No sleep training yet.
- 3–4 months: 14–16 hours total, starting to form circadian rhythm. Can attempt gentle sleep shaping.
- 4–6 months: 12–15 hours total. Most babies ready for sleep training. Aim for 6–8 hour stretches.
- 6–9 months: 12–14 hours total. Night feeds typically reduce or stop. 8–10 hour stretches possible.
- 9–12 months: 12–14 hours total. Most babies sleeping 10–12 hours at night with 1–2 naps.
6. Common Babies Sleeping Through the Night Disruptions
- Sleep regressions — happen around 4 months, 8–10 months, and 12 months. Stay consistent with your routine. They pass.
- Teething — can disrupt sleep for days at a time. Offer a teething toy before bed and consider infant Tylenol if they seem in pain.
- Illness — always respond to a sick baby. Sleep training rules go out the window when your baby is unwell. Resume your routine once they recover.
- Separation anxiety — peaks around 9 months. Brief reassurance check-ins without picking up usually help. Stay boring and consistent.
- Travel or schedule disruptions — expect a few rough nights after traveling or a schedule change. Re-establish your routine as quickly as possible.
FAQs: When Do Babies Start Sleeping Through the Night
Is it okay if my baby isn’t sleeping through the night at 6 months?
Yes, completely. About 38% of 6-month-olds were not sleeping through the night in one study. Every baby is different. If you have concerns about your baby’s sleep patterns, talk to your pediatrician — but know that there’s a wide range of normal.
When can I start sleep training?
Most pediatricians recommend waiting until at least 4 months and when your baby weighs around 12–13 pounds, indicating they can go longer stretches without feeding. Always check with your doctor before starting any sleep training method.
Will sleep training harm my baby?
Research consistently shows that evidence-based sleep training methods do not cause emotional or psychological harm to babies. Multiple long-term studies have found no negative effects on attachment, stress levels, or behavior. The AAP supports sleep training as safe and effective for healthy babies.
My baby was sleeping through the night and suddenly stopped. What happened?
This is extremely common and usually caused by a sleep regression, teething, illness, a developmental leap, or a change in routine. Go back to basics — consistent routine, early bedtime, drowsy but awake. Most regressions resolve within 2–4 weeks.
Final Thoughts on When Babies Start Sleeping Through the Night
The honest answer to when do babies start sleeping through the night is: somewhere between 3 and 6 months for most babies, with a wide range of normal on either side. The timeline matters less than having realistic expectations and a consistent approach. Whatever method you choose, consistency is what makes it work.
And on those nights when nothing seems to work — you are not failing. You are doing one of the hardest jobs there is. It gets better. It always gets better.
If you’re setting up your nursery around the same time, don’t miss our upcoming post Best Baby Monitors : Top Picks for Every Budget — everything you need to choose the right monitor before your baby arrives.
Also If your baby is also starting solid foods around this time, don’t miss our post The Best Silicone Baby Led Weaning Set for Stress-Free Mealtimes — everything you need to start solids safely and confidently alongside your new sleep routine.