Most babies can sleep five to six hours straight by around 6 months of age, but getting there takes a combination of timing, consistency, and choosing an approach that fits your family. Some babies start sleeping longer stretches as early as 4 months, while others need more time. The good news: sleep training is well-studied, and none of the common methods have been shown to cause lasting emotional or behavioral harm.
When Your Baby Is Actually Ready
Babies don’t develop regular sleep cycles until about 4 months old. Before that point, newborns sleep 16 to 17 hours a day but only in stretches of one to three hours. Their brains simply aren’t wired yet to consolidate sleep into longer blocks, so formal sleep training before 4 months won’t stick.
Starting at 4 months, you can begin putting your baby down drowsy but not fully asleep. This is the single most important habit to build: letting your baby learn to fall asleep independently in their own sleep space. A baby who falls asleep in your arms and then wakes up in a crib at 2 a.m. doesn’t know how to get back to sleep without recreating those same conditions. A baby who drifts off on their own in the crib already has that skill and can use it during normal nighttime wakings.
Night Feeds: When They’re Still Needed
Hunger is the most common reason babies under 6 months wake at night, and you shouldn’t try to eliminate feeds your baby genuinely needs. The timeline for dropping night feeds depends on how your baby eats. Formula-fed babies can typically phase out night feeds around 6 months, because formula digests more slowly and they’re getting enough calories during the day by that age. Breastfed babies may still benefit from night feeds longer, and most experts suggest waiting until around 12 months to fully night-wean a breastfed child.
If you’re unsure whether a specific waking is hunger or habit, consider when your baby last ate and how much they consumed during the day. A baby who eats well during daylight hours and still wakes at the same time every night is more likely operating on habit than genuine need.
Set Up the Right Sleep Environment
Before you choose a training method, make sure the room itself isn’t working against you. Always place your baby on their back for every sleep, including naps. Keep the crib free of blankets, pillows, bumper pads, and stuffed animals. Watch for signs of overheating like sweating or a hot chest, and dress your baby in a sleep sack rather than loose blankets.
White noise can help mask household sounds and create a consistent sleep cue. Keep the volume at or below 50 decibels (roughly the level of a quiet conversation) and place the machine at least 6.5 feet from your baby’s crib. Louder or closer positioning can potentially affect hearing over time.
A short, predictable bedtime routine also matters. Bath, feeding, a book, a song, then into the crib drowsy. The routine itself matters less than the consistency. Your baby starts to recognize the sequence as a signal that sleep is coming.
Graduated Check-Ins (The Ferber Method)
This is the most widely recognized sleep training approach. You put your baby down awake, leave the room, and wait a set number of minutes before briefly checking in. Each check-in is short (one to two minutes) and calm. You can offer a gentle pat or quiet words, but you don’t pick the baby up. Then you leave and wait a longer interval before checking again.
On the first night, you wait 3 minutes before the first check, then 5 minutes, then 10 minutes, staying at 10-minute intervals after that. Each subsequent night, the starting interval increases. By day seven, you’re waiting 20 minutes before the first check-in and up to 30 minutes between later ones. If your baby falls asleep but wakes again later that night, you restart the interval sequence from the beginning.
These intervals aren’t rigid rules. They can be adjusted to fit what feels manageable for your family. Some parents see improvement within a few days. Studies on graduated extinction methods show that most families complete training within about four weeks, though many notice a dramatic reduction in crying by the end of the first week.
The Chair Method (A Gentler Option)
If the idea of leaving the room feels too difficult, the chair method offers a slower path. After your bedtime routine, place your baby in the crib drowsy and sit in a chair right next to the crib. Stay there quietly until your baby falls asleep, then leave. If they wake and cry, return to the chair and sit again until they settle.
Every few nights, move the chair a little farther from the crib. First toward the middle of the room, then near the door, then just outside the door, and eventually out of sight entirely. The gradual distance teaches your baby that they can fall asleep without you right there. This method typically takes longer than graduated check-ins, and there’s no fixed timeline for how quickly your child will adjust to each new chair position. Some babies adapt in a couple of nights per move, others need more time.
Full Extinction (Cry It Out)
The most straightforward and often fastest method: put your baby down awake, say goodnight, and don’t return until morning (or until a scheduled feed, if your baby still needs one). There are no check-ins. This approach tends to involve more intense crying on the first one to three nights but often produces results faster than graduated methods.
This method gets the most pushback from parents who worry about the emotional toll. A study published in Pediatrics measured stress hormones in babies undergoing sleep training and found that babies in sleep training groups actually had slightly lower cortisol levels than babies with no sleep training. Twelve months later, researchers found no differences in emotional health, behavioral health, or the quality of the parent-child bond between groups. The crying is temporary. The attachment is not damaged.
Sleep Regressions Will Happen
Even after successful training, your baby will likely hit periods where sleep falls apart again. These regressions are driven by developmental changes, not a failure of your approach.
The 4-month regression is one of the most disruptive. Your baby is becoming more social and physically active, starting to roll over and grab objects with purpose. They’re also transitioning from newborn sleep patterns to more adult-like sleep cycles, which temporarily makes it harder to stay asleep. If you haven’t started sleep training yet, this regression is often what pushes parents to begin.
Around 9 months, another common regression hits. Teething is often underway (first teeth typically appear between 6 and 10 months), and your baby is developing separation anxiety for the first time. At this age, babies understand object permanence: they know you exist even when you’re not visible. A 4-month-old who can’t see you simply moves on. A 9-month-old knows you’re nearby and will call out for you. This can make nighttime wakings louder and more persistent, but it’s a normal cognitive leap, not a sign that something is wrong.
The best response to a regression is to stay consistent with whatever method you’ve been using. Most regressions resolve within two to four weeks. Introducing new sleep crutches during a regression (rocking to sleep, bringing baby into your bed) can create habits that outlast the regression itself.
Picking the Right Method for Your Family
No single approach works best for every baby. The most important factor isn’t which method you choose but whether you can stick with it consistently. Switching methods mid-training or being inconsistent with your responses teaches your baby that enough crying will change the outcome, which typically makes the process longer and harder for everyone.
If you want faster results and can tolerate a few tough nights, graduated check-ins or full extinction tend to work within one to two weeks. If you need to be present in the room for your own comfort, the chair method is a reasonable path, though it requires more patience. Whatever you choose, both parents or caregivers need to be on the same page. One person caving at 3 a.m. resets the process.