Most babies start sleeping through the night, meaning a stretch of 6 to 8 hours, around 3 months of age or when they reach 12 to 13 pounds. But this varies widely. Some babies don’t hit this milestone until closer to their first birthday, and that’s still within the range of normal. The good news is that there are concrete steps you can take to set the stage for longer stretches of sleep, even if your baby isn’t quite there yet.
Why Newborns Can’t Sleep Through the Night
Babies are born with an immature internal clock. They don’t produce melatonin (the hormone that signals nighttime drowsiness) at birth, and the stress hormone cortisol, which helps regulate the sleep-wake cycle, doesn’t settle into a predictable rhythm until somewhere between 2 weeks and 9 months of age. Without these chemical signals telling day from night, newborns sleep in short, scattered bursts around the clock.
One fascinating finding: in a case study of a breastfed infant exposed only to natural light for the first six months, measurable sleep-wake rhythms appeared by around 45 days, and nighttime sleep onset aligned with sunset by day 60. That’s faster than typically reported, and it highlights how much light exposure matters in wiring your baby’s internal clock early on.
When Night Feedings Are Still Necessary
Before you focus on longer sleep stretches, it helps to know whether your baby still genuinely needs to eat overnight. For breastfed babies, night feedings are often necessary until around 12 months. Bottle-fed babies may be ready to drop night feeds around 6 months. The general guideline is that most babies, especially breastfed ones, shouldn’t be expected to sleep long continuous stretches without feeding until after 6 months of age.
This doesn’t mean you can’t work on sleep habits before then. It just means that a 4-month-old waking to eat at 2 a.m. is doing exactly what their body requires. Trying to eliminate that feeding too early can backfire, leaving you with a hungry, overtired baby who sleeps worse, not better.
Build the Right Sleep Environment
Your baby’s sleep space directly affects how well they settle and stay asleep. The American Academy of Pediatrics recommends a firm, flat mattress that doesn’t indent under your baby’s weight, fitted tightly inside a crib, bassinet, or play yard that meets Consumer Product Safety Commission standards. Use a fitted sheet only. Nothing else belongs in the crib: no pillows, blankets, bumper pads, stuffed animals, or weighted products of any kind.
Keep the room between 68 and 72°F (20 to 22°C) with humidity between 30 and 50 percent. A room that’s too warm is both a sleep disruptor and a safety concern. Dress your baby in a sleep sack or wearable blanket appropriate for the temperature rather than using loose bedding.
Room sharing (keeping the crib in your bedroom) for at least the first 6 months can reduce the risk of SIDS by as much as 50 percent. Bed sharing, on the other hand, is not recommended under any circumstances. The risk of sleep-related death is up to 67 times higher when a baby sleeps with someone on a couch, armchair, or cushion.
Use Light and Darkness to Set the Clock
Since your baby’s circadian system is still developing, you can actively help it along. During the day, expose your baby to plenty of natural light, especially in the morning. Keep daytime feeds and interactions stimulating and social. At night, do the opposite: dim the lights an hour before bedtime, keep nighttime feedings quiet and boring, and avoid screens or bright overhead lights during wake-ups.
This consistent contrast between bright days and dark nights gives your baby’s brain the environmental cues it needs to start producing melatonin on a predictable schedule. It’s one of the simplest interventions you can make, and it works even in the early weeks before formal sleep training is appropriate.
Create a Consistent Bedtime Routine
A predictable sequence of events before bed helps your baby’s brain recognize that sleep is coming. This doesn’t need to be elaborate. A bath, a feed, a short book or song, then into the crib drowsy but awake is a classic sequence that works for most families. The key is consistency: same order, same time, same environment, every night.
Putting your baby down drowsy but not fully asleep is one of the most effective habits you can build. Babies who fall asleep independently at bedtime are more likely to resettle on their own when they wake between sleep cycles overnight, rather than needing you to recreate the conditions (rocking, nursing, bouncing) that got them to sleep in the first place.
Get Daytime Naps Right
What happens during the day has a significant effect on nighttime sleep. Research shows that frequent napping is associated with more fragmented nighttime sleep, with more awakenings and longer times to fall asleep. Late naps are particularly disruptive. The issue isn’t napping itself, which babies obviously need, but napping too often or too close to bedtime, which reduces the “sleep pressure” that helps babies fall and stay asleep at night.
For babies under 6 months, naps will still be frequent and somewhat irregular. But as your baby gets older, aim to consolidate naps into fewer, more predictable blocks earlier in the day. By 6 to 9 months, most babies do well on two naps. By 12 to 18 months, many are transitioning to one. Keeping the last nap from running too late in the afternoon protects nighttime sleep quality.
When and How to Sleep Train
Sleep training generally refers to any structured approach to teaching your baby to fall asleep independently. Most pediatricians suggest waiting until at least 4 to 6 months, when your baby’s circadian system is more developed and night feedings may be less frequent.
Several approaches exist along a spectrum. Graduated extinction (often called the Ferber method) involves putting your baby down awake and checking in at increasing intervals, say 3 minutes, then 5, then 10, without picking them up. The goal is to give your baby space to practice settling while still offering reassurance. “Camping out” or chair methods have you sit near the crib and gradually move farther away over the course of a week or two. At the other end, full extinction means putting the baby down and not returning until morning (or the next scheduled feed).
No single method is proven superior. What matters most is consistency. Switching approaches every other night or giving in after 20 minutes of crying teaches your baby that persistence works, which makes the process harder and longer. Most families who commit to a consistent approach see meaningful improvement within 3 to 7 nights.
Expect Sleep Regressions
Even after your baby is sleeping well, there are roughly six stages when sleep tends to fall apart temporarily: around 4, 6, 8, 12, 18, and 24 months. These regressions are tied to developmental milestones, and understanding that can help you stay calm when they hit.
The 4-month regression is arguably the most significant because it reflects a permanent change in your baby’s sleep architecture. Around this age, babies shift from newborn-style sleep into more adult-like sleep cycles, which means more partial awakenings between cycles. This isn’t a step backward; it’s the brain maturing. But it can feel brutal if your baby was previously sleeping long stretches.
At 6 months, hunger from increased daytime activity, teething, and early separation anxiety can all disrupt sleep. The 8-month regression often coincides with learning to pull to standing or crawl, skills your baby may want to practice at 3 a.m. Later regressions at 12 and 18 months are linked to walking, language development, growing independence, and changes in circadian rhythms.
Regressions typically last 2 to 6 weeks. The best strategy is to stay consistent with your routines and sleep environment. Introducing new sleep crutches during a regression (bringing the baby into your bed, adding a new rocking-to-sleep habit) can create patterns that outlast the regression itself.
Swaddling Safely in the Early Months
Swaddling can help young babies sleep longer by reducing the startle reflex that wakes them. But it comes with a firm safety limit: you must stop swaddling at the first sign your baby is trying to roll over. A swaddled baby who rolls to their stomach cannot use their arms to reposition, which creates a suffocation risk. For most babies, this means transitioning out of the swaddle somewhere between 2 and 4 months. Transitional sleep sacks with arms free are a good next step.