Sleep training is the process of teaching a baby to fall asleep independently, without being rocked, nursed, or held until they drift off. The core goal is helping your baby learn to self-soothe so that when they wake during the night (which all babies do between sleep cycles), they can settle back to sleep on their own. Most babies are ready to begin around 4 months old, though some do better closer to the 6-month mark.
Why Babies Need to Learn This
Newborns can’t self-soothe. They have short sleep cycles and genuinely need to eat during the night, so sleep training isn’t appropriate for them. But somewhere around 4 months, a baby’s sleep patterns start to mature, and they become developmentally capable of linking sleep cycles together and calming themselves down without a parent’s help.
The problem sleep training solves is a specific one: sleep associations. If your baby always falls asleep while being rocked or fed, they come to rely on that association. When they naturally wake between sleep cycles (every 45 minutes to 2 hours), they can’t get back to sleep without that same rocking or feeding. Sleep training replaces those external associations with internal ones, like thumb-sucking, shifting positions, or simply settling down on their own.
The Main Methods
Sleep training isn’t one technique. It’s an umbrella term covering several approaches that range from hands-off to very gradual. All of them share the same foundation: putting your baby down drowsy but awake, then giving them space to figure out how to fall asleep.
Full Extinction (Cry It Out)
This is the most straightforward approach. You complete your bedtime routine, place your baby in the crib, say goodnight, and leave the room. You don’t go back in to respond to crying as they work on falling asleep. Before starting, you make sure the baby is fed, has a clean diaper, is comfortable, and is showing sleepy cues like yawning or rubbing their eyes. The idea is that without any external intervention, the baby learns relatively quickly that the crib is where sleep happens.
Graduated Extinction (The Ferber Method)
If full extinction feels too abrupt, graduated extinction offers a middle ground. The most well-known version is the Ferber method, which uses timed check-ins that get progressively longer. On the first night, you wait 3 minutes before briefly checking on your baby, then 5 minutes before the next check-in, then 10 minutes for all remaining check-ins that night. On the second night, the intervals stretch to 5, 10, and 12 minutes. By the third night, you’re waiting 10, 12, and 15 minutes. During check-ins, you offer brief verbal reassurance but don’t pick the baby up or stay in the room.
The gradually increasing wait times serve two purposes: they give your baby longer stretches to practice self-settling, and they give you a structured plan that’s easier to stick with than going cold turkey.
The Chair Method
This is one of the gentler approaches. You put your baby down awake and then sit in a chair next to the crib, staying there until they fall asleep. If they cry, you remain seated quietly rather than picking them up. Every few nights, you move the chair a little farther from the crib, progressively closer to the door, then outside the door, and eventually you’re gone entirely. Some parents simply stand in the room and move incrementally toward the door each night instead of using a chair. This method takes longer but lets your baby adjust to your absence in small steps.
How to Set Up the Room
Sleep training works best when the sleep environment is consistent and boring. The room should be dark, and many parents use white noise to block out household sounds and create a reliable auditory cue that it’s sleep time. Temperature matters too: a room that’s too warm or too cold makes settling harder. Dress your baby so they’re comfortable without loose blankets, which aren’t safe in the crib.
The American Academy of Pediatrics recommends using a firm, flat mattress in a safety-approved crib with only a fitted sheet. Nothing else goes in the crib: no pillows, stuffed animals, bumpers, or blankets. They also recommend keeping the baby’s crib in your room for at least the first 6 months, which means sleep training and room-sharing can happen at the same time. You’re not necessarily moving your baby to a separate nursery when you start.
Building a Bedtime Routine
Every sleep training method depends on a predictable bedtime routine. This is the sequence of events that signals to your baby that sleep is coming. It might include a diaper change, a feeding, a bath, a book, or a song. The specific activities matter less than doing them in the same order every night. Over time, the routine itself becomes a sleep cue: your baby’s brain starts winding down as soon as the familiar sequence begins.
One critical detail: if feeding is part of the routine, it should happen early in the sequence rather than last. If the last thing before the crib is nursing or a bottle, you’re rebuilding the exact feeding-to-sleep association you’re trying to break.
How Long It Takes
Most families see meaningful improvement within 3 to 7 nights, though “improvement” doesn’t always mean perfection right away. Your baby might go from waking every hour to waking every 2 to 3 hours in the first week, then continue consolidating sleep over the following weeks. The more consistent you are with the method, the faster it works. Giving in partway through a crying stretch and picking the baby up can reset the process, because it teaches the baby that enough crying eventually produces the result they want.
Setbacks are normal. Illness, teething, travel, and developmental leaps (like learning to stand in the crib) can temporarily disrupt sleep even after successful training. These regressions usually resolve within a few days if you return to your method consistently.
What Sleep Training Doesn’t Mean
Sleep training doesn’t mean ignoring your baby’s needs. If your baby is hungry, in pain, or sick, you respond. The goal is specifically about the moment of falling asleep: teaching your baby that they can do it without you physically being involved in the process. Nighttime feedings may still be appropriate during and after sleep training, especially for younger babies who genuinely need calories overnight. Sleep training addresses how your baby falls asleep, not whether they eat at night.
It also doesn’t mean choosing one rigid method and never deviating. Many parents blend approaches, starting with the chair method and transitioning to timed check-ins, or using graduated extinction but shortening the intervals to something they’re more comfortable with. The best method is the one you’ll actually follow through on consistently, because consistency is what teaches the baby the new pattern.
Choosing the Right Approach
Your baby’s temperament matters. Some babies escalate when a parent enters the room for check-ins, getting more upset each time rather than less. For those babies, full extinction sometimes works faster and with less total crying than graduated methods. Other babies genuinely need the reassurance of seeing a parent periodically and do well with Ferber-style check-ins or the chair method.
Your own tolerance matters just as much. If you know you can’t listen to extended crying without intervening, a gradual method gives you a structured way to stay involved while still making progress. Starting with a method you’ll abandon after one night helps no one. Pick the approach that matches both your baby’s personality and your own, make sure every caregiver in the household is on the same page, and commit to giving it at least a full week before deciding whether it’s working.