Most babies are ready to start sleep training around 4 months old, though some do better closer to 6 months. The goal is straightforward: teaching your baby to fall asleep independently so they (and you) can get longer stretches of uninterrupted rest. There’s no single “right” method. The best approach is the one you can follow consistently for at least a week or two.
When Your Baby Is Ready
Before 4 months, babies have short, immature sleep cycles and genuinely need to eat overnight. Their brains haven’t developed the ability to self-soothe yet, so sleep training a newborn doesn’t work and isn’t recommended.
Around 4 months, two things shift. Your baby’s circadian rhythm starts functioning more like an adult’s, producing longer stretches of consolidated sleep. And their neurological development reaches a point where self-soothing becomes possible. A general benchmark used by pediatricians is 4 months old and at least 14 pounds, because at that weight many babies no longer need overnight feedings to sustain their caloric needs. If your baby was premature or has specific health concerns, check with your pediatrician before starting.
Build a Bedtime Routine First
A consistent bedtime routine is the foundation that makes every sleep training method work better. Aim for 30 to 45 minutes of the same calming activities in the same order each night. This teaches your baby to recognize that sleep is coming.
A routine that works well for most families looks something like this: a warm bath, a feeding about 15 minutes before the crib, a book or two, soft music or gentle rocking, then into the crib drowsy but still awake. That last part is key. If your baby falls asleep in your arms and then wakes up alone in the crib, they’ll be confused and upset. The whole point of sleep training is teaching them to make that final transition from drowsy to asleep on their own.
The Ferber Method (Graduated Check-Ins)
This is the most widely used sleep training approach. You put your baby down awake, leave the room, and return at gradually increasing intervals to briefly reassure them. You don’t pick them up during check-ins. You might pat their chest, say a few calm words, then leave again. The visits are short, about one to two minutes.
The interval schedule, developed by pediatric sleep researcher Richard Ferber, looks like this:
- Night 1: Wait 3 minutes before your first check, then 5 minutes, then 10 minutes for every check after that.
- Night 2: Start at 5 minutes, then 10, then 12 for all remaining checks.
- Night 3: Start at 10 minutes, then 12, then 15.
- Night 4: Start at 12, then 15, then 17.
- Night 5: Start at 15, then 17, then 20.
- Night 6: Start at 17, then 20, then 25.
- Night 7: Start at 20, then 25, then 30.
Ferber notes these intervals can be adjusted. If starting at 3 minutes feels too short or too long for your family, you can shift the entire schedule. The principle matters more than the exact numbers: intervals get longer each night, giving your baby progressively more time to settle independently.
The Chair Method (Gradual Withdrawal)
If timed check-ins feel too structured, the chair method offers a slower, more presence-based approach. After your bedtime routine, place your baby in the crib drowsy but awake, then sit in a chair right next to the crib. Don’t pick them up or interact much. Just be there. Stay until they fall asleep, then quietly leave.
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 you’re gone entirely. If your baby wakes and cries, come back and sit in the chair at its current position until they settle again. This method typically takes longer than the Ferber approach, often two to three weeks, but some parents find the constant physical presence easier to sustain emotionally.
Pick Up, Put Down
This is the most hands-on option. After your bedtime routine, lay your baby in the crib and leave the room. If they cry, come back, pick them up, and soothe them. The critical rule: put them back down before they fall asleep in your arms. As soon as their eyelids start drooping, back in the crib they go. Then leave again. Repeat as many times as needed until they fall asleep in the crib.
Some nights this means dozens of pickups. It can be physically exhausting, but it works well for parents who aren’t comfortable with any amount of solo crying. Over the course of a week or two, the number of pickups per night typically drops as your baby learns to bridge that final gap to sleep on their own.
Full Extinction (Cry It Out)
The most direct method: after your bedtime routine, put your baby in the crib, say goodnight, close the door, and don’t go back in until morning (or until a scheduled feeding, if your baby still needs one). No check-ins, no re-entering the room.
This is the hardest method emotionally for parents, and it’s not for everyone. But it tends to produce the fastest results because there are no partial reinforcements. Check-ins, while comforting to parents, can sometimes re-escalate a baby’s crying. Removing that variable simplifies the learning process for the baby, even though the first few nights can be intense.
What the First Week Actually Looks Like
Regardless of which method you choose, expect the first three nights to be the hardest. Night one often involves 30 to 60 minutes of crying, sometimes more. Night two is frequently similar or even slightly worse. This is normal.
Between nights 3 and 5, many families hit what’s called an extinction burst: a sudden spike in crying that’s worse than the first night. It feels like a setback, but it’s actually a sign the old pattern is breaking down. Think of it as your baby’s last protest before accepting the new routine. This burst can sometimes extend to nights 7 through 10, but it passes. The worst thing you can do during an extinction burst is abandon your method, because that teaches your baby that escalating eventually works.
By the end of the first week, most babies are falling asleep with significantly less fussing. By two weeks, many are going down with little to no protest.
Sleep Training and Night Feeds
Sleep training and night weaning are separate processes. You can teach your baby to fall asleep independently while still feeding them once or twice overnight. If your baby is under 6 months or under 14 pounds, they may genuinely need those calories. Many parents choose to keep one “dream feed” around 10 or 11 p.m. while sleep training for the rest of the night.
The key distinction: you’re training the skill of falling asleep, not eliminating all nighttime contact. If your baby wakes for a scheduled feed, go in, feed them in dim light with minimal stimulation, then put them back down awake.
Will It Harm Your Baby?
This is the question that keeps most parents up at night (on top of the baby keeping them up). A study published in Pediatrics followed 43 families through sleep training and measured the stress hormone cortisol in the babies’ saliva. Babies in the sleep training groups actually showed slightly lower cortisol levels than babies who weren’t sleep trained. After a full year of follow-up, researchers found no differences in emotional health, behavioral health, or parent-child attachment between the groups.
A meta-analysis of 13 studies covering nearly 6,000 families found that sleep interventions improved not only how long babies slept at night but also reduced symptoms of maternal depression. Sleep deprivation is a significant risk factor for postpartum mood disorders, and helping a baby sleep better has measurable benefits for the whole family.
Setting Up the Room
A few environmental basics make a real difference. Keep the room dark, genuinely dark, not just dim. Blackout curtains help, especially in summer. Use a white noise machine to buffer household sounds and create a consistent auditory cue for sleep. Keep the temperature comfortable for a lightly dressed adult. If you’re comfortable in a t-shirt, your baby in a sleep sack is likely fine.
The crib should have a firm, flat mattress with a fitted sheet and nothing else. No blankets, pillows, stuffed animals, or bumpers. This isn’t just a sleep training recommendation. It’s a safety standard at every age until your child moves to a toddler bed.
Consistency Is the Method
The single biggest predictor of whether sleep training works isn’t which method you pick. It’s whether you stick with it. Switching methods midstream, making exceptions on hard nights, or having one parent follow the plan while the other doesn’t creates confusion that extends the process and increases total crying.
Pick the method that both caregivers can commit to for at least seven consecutive nights. Talk through the plan before you start. Agree on exactly what you’ll do when the crying hits its peak at 2 a.m. and every instinct tells you to scrap the whole thing. That moment is coming, and having a plan you’ve already agreed on is what gets you through it.