Most babies can sleep for longer stretches of six to eight hours by around 4 to 6 months of age, but getting there takes a combination of the right environment, a consistent routine, and a readiness your baby has to grow into. There’s no single trick that works overnight. Instead, it’s a set of habits that, layered together, teach your baby to fall asleep independently and stay asleep longer.
Why Babies Wake Up at Night
Newborns aren’t wired to sleep through the night. Their stomachs are tiny, they need frequent feedings, and their sleep cycles are dominated by deep sleep with very little light sleep mixed in. That changes around 3 to 4 months, when your baby’s brain starts cycling through phases of deep and light sleep the way adults do. During those lighter phases, babies are more likely to wake up briefly, and if they don’t know how to settle themselves back down, they cry for you.
This is the 4-month sleep regression parents dread, and it’s not actually a regression at all. It’s a permanent, healthy shift in how your baby’s brain handles sleep. The good news is that once you understand this shift, you can start building habits that help your baby navigate those light-sleep phases on their own.
Hunger is the other major reason babies wake. Formula-fed babies can generally go longer between feedings sooner than breastfed babies because formula digests more slowly. But even a baby who is physically capable of sleeping longer stretches may wake out of habit if nighttime feeding has become part of their sleep association.
Build a Consistent Bedtime Routine
A predictable sequence of events before bed is one of the most effective tools you have. It signals to your baby’s brain that sleep is coming, and over time, the routine itself becomes calming. Aim for 30 to 45 minutes, starting at the same time every night and following the same order.
A solid routine looks something like this:
- Bath time. Even a short warm bath helps signal the transition from daytime to nighttime.
- Calming activities. Reading a book, playing soft music, gentle rocking, or cuddling. Keep lights dim and voices low.
- A feeding. Offering a feed about 15 minutes before your baby goes into the crib can settle them physically and emotionally while making them a little drowsy.
The key is putting your baby down drowsy but awake. If your baby always falls asleep in your arms or while feeding, they learn to associate those things with sleep. When they wake during a light-sleep phase at 2 a.m., they’ll need the same conditions to fall back asleep, which means calling for you. Placing them in the crib while they’re still slightly awake teaches them that the crib is where sleep happens.
Set Up the Right Sleep Environment
Your baby’s room should be dark, cool, and boring. Blackout curtains help, especially in summer months when it’s still light at bedtime. White noise can mask household sounds that might jar your baby awake during light-sleep phases. Keep it at a consistent, moderate volume.
Humidity in the nursery should stay between 35 and 50 percent. Air that’s too dry or too humid can make your baby cough or have difficulty breathing comfortably, which disrupts sleep. A simple hygrometer (most humidifiers have one built in) lets you monitor this.
For safety, your baby should sleep on their back on a firm, flat mattress with only a fitted sheet. No loose blankets, pillows, stuffed animals, or bumper pads. The AAP recommends babies sleep in their own crib, bassinet, or portable play yard, in the same room as you for at least the first six months. Avoid letting your baby sleep on couches, armchairs, or in swings and car seats outside the car.
One small addition worth considering: a pacifier. Pacifier use during sleep is associated with roughly a 50 percent reduction in the risk of SIDS. You don’t need to reinsert it if it falls out after your baby is asleep, and there’s no need to force it if your baby refuses.
When and How to Night Wean
Your baby can’t sleep through the night if they genuinely need to eat. How soon you can drop night feeds depends partly on how your baby is fed. Formula-fed babies can often phase out night feedings starting around 6 months. For breastfed babies, night weaning is generally appropriate from around 12 months, though many breastfed babies naturally reduce night feeds before that.
If your pediatrician confirms your baby is gaining weight well and is developmentally ready, you can start gradually. For bottle-fed babies, reduce the amount in each nighttime bottle by about half an ounce every few nights. For breastfed babies, shorten the duration of each nighttime feed by a minute or two. The goal is to slowly shift those calories into daytime so your baby’s hunger cues adjust.
Some babies drop night feeds easily. Others protest for a week or two before adjusting. If your baby is eating well during the day and growing on track, brief fussing during this transition is normal.
Sleep Training Methods That Work
Sleep training isn’t one thing. It’s a spectrum of approaches, and the best one is whichever method you can stick with consistently. All evidence-based methods share the same core principle: giving your baby the opportunity to practice falling asleep independently.
Pick Up, Put Down
This is one of the gentlest structured methods. You go through your bedtime routine, place your baby in the crib awake, and quietly leave the room. When your baby fusses or cries, you go back in, pick them up, and soothe them. The important part: as soon as their eyelids start to droop, you put them back down in the crib before they’re fully asleep. You repeat this cycle as many times as needed until they drift off in the crib. The first few nights might mean dozens of pick-ups. It gets easier.
Timed Check-Ins
Sometimes called graduated extinction, this method involves putting your baby down awake and leaving the room, then returning at increasing intervals to briefly reassure them (without picking them up). You might check in after 3 minutes, then 5, then 10. The check-ins are short and low-key: a pat, a quiet “shh,” then you leave again. Most families see significant improvement within three to five nights.
Full Extinction
This is the “cry it out” approach, where you put your baby down and don’t return until morning (or until a scheduled feeding). It’s the hardest for parents emotionally, but research consistently shows it works the fastest, often within two to three nights. It does not cause lasting emotional harm, though it’s not the right fit for every family.
Whichever method you choose, consistency matters more than the method itself. Switching approaches every other night confuses your baby and extends the process.
Common Setbacks and How to Handle Them
Even after your baby is sleeping through the night, expect disruptions. Teething, illness, travel, and developmental milestones like learning to crawl or stand can all temporarily wreck sleep. These regressions typically last one to two weeks. The best approach is to offer comfort as needed during the disruption, then return to your normal routine and expectations once it passes. Babies who already have strong sleep skills tend to bounce back quickly.
Early morning waking is another common frustration. If your baby consistently wakes at 5 a.m. and won’t go back to sleep, the issue is often a bedtime that’s too early or too late, or a nap schedule that needs adjusting. Most babies between 4 and 12 months do well with a bedtime between 6:30 and 8:00 p.m. and need two to three naps during the day, gradually dropping to two naps around 8 to 9 months.
If your baby is over 6 months, eating well during the day, sleeping in a safe and comfortable environment, and you’ve been consistent with a method for at least a week without improvement, it’s worth checking in with your pediatrician to rule out issues like reflux or ear infections that could be causing discomfort at night.