Most babies are ready to start sleep training around 4 months old, once their internal sleep cycles have matured enough for them to learn how to fall asleep independently. At this age, babies begin producing their own melatonin, their circadian rhythm kicks in, and many no longer need overnight feedings. A general guideline is 4 months and at least 14 pounds, since babies at that weight can typically go longer stretches without eating.
Sleep training isn’t one single technique. It’s a category of approaches that all share the same goal: teaching your baby to fall asleep on their own when placed in the crib awake. Here’s how to set up for success and choose the method that fits your family.
Why Newborns Aren’t Ready
Before about 3 months, babies don’t yet regulate their own sleep cycles or fully distinguish between day and night. They have short sleep cycles, need frequent feedings, and haven’t developed the ability to self-soothe. Trying to sleep train a newborn will frustrate everyone and won’t work. Wait until your baby is at least 4 months old and showing signs of longer natural sleep stretches before you begin.
Set Up the Room First
Your baby’s sleep environment matters more than which method you pick. Keep the room temperature between 68 and 72 degrees Fahrenheit. Anything above 72 degrees may be too warm. The room should be dark, not just dim, because even small amounts of light can signal wakefulness to a developing circadian rhythm. Use a white noise machine if outside sounds are an issue, and make sure the crib follows safe sleep guidelines: firm mattress, fitted sheet, nothing else inside.
Build a Consistent Bedtime Routine
A predictable bedtime routine is the foundation of every sleep training method. Aim for 30 to 45 minutes, and do it in the same order every night. A simple, effective sequence looks like this:
- Bath: A warm bath helps trigger sleepiness by raising and then lowering your baby’s body temperature.
- Calming activities: Read a short book, play soft music, or spend a few minutes cuddling and rocking. Slow, gentle movement helps your baby wind down.
- Final feeding: Feed your baby about 15 minutes before placing them in the crib. This settles them physically and emotionally without creating a direct association between eating and falling asleep.
Watch for sleepy cues like yawning, eye rubbing, and ear pulling. You want your baby drowsy but still awake when they go into the crib. This is the critical piece: if your baby falls asleep in your arms and then wakes up in the crib, they haven’t practiced the skill you’re trying to teach.
Choose Your Method
All sleep training methods work. They differ in how much crying is involved and how long the process takes. Pick the one you can stick with consistently, because switching methods mid-process resets the clock.
Full Extinction (Cry It Out)
This is the most straightforward approach. After your bedtime routine, place your baby in the crib awake, say goodnight, and leave the room. You don’t go back in to soothe them. The idea is that without intervention, your baby learns to settle themselves. Make sure all their needs are met beforehand: clean diaper, full belly, comfortable temperature.
This method can eliminate bedtime crying very quickly, often within a few days. It’s the hardest emotionally for parents, but it tends to be the fastest. Before starting, make sure every caregiver in the house is on the same page about the plan and the timeline. If one person gives in on night two, you’ll need to start over.
Graduated Extinction (Ferber Method)
The Ferber method adds structured check-ins so you’re not leaving your baby entirely on their own. You place your baby in the crib awake, leave the room, and wait a set number of minutes before briefly checking in. Each check-in is short: you can pat or shush but don’t pick your baby up. Then you leave again and wait a longer interval before the next check.
On the first night, you wait 3 minutes before your first check, then 5 minutes, then 10 minutes. After the third check, you hold at 10-minute intervals for the rest of the night. Each subsequent night, the intervals stretch longer. By night 7, you’re starting at 20 minutes and working up to 30. This method typically takes about a week.
Chair Method
This is a gentler option for parents who want to stay in the room. After your bedtime routine, place your baby in the crib and sit in a chair right next to it. You can offer quiet reassurance but avoid picking your baby up. Every few nights, move the chair further from the crib, toward the door, then outside the door, until eventually you’re not in the room at all.
The chair method involves less crying, but it takes significantly longer and there’s no predictable timeline. Some babies also find a parent’s visible presence more stimulating than soothing, which can backfire. It works best for older babies and toddlers who find your proximity genuinely calming.
Fading
Fading involves gradually reducing the amount of help you give your baby at bedtime. If you normally rock them to sleep, you rock them until they’re almost asleep, then put them down. Over time, you rock less and less until they’re going into the crib fully awake. This is the slowest approach, typically taking up to two weeks, but it involves the least crying.
How to Handle Night Feedings
Sleep training doesn’t necessarily mean eliminating all night feeds immediately. Many 4-month-olds still need one or two overnight feeds, and that’s fine. The key is separating feeding from falling asleep. Feed your baby when they’re genuinely hungry, not as a tool to get them back to sleep after every sleep cycle.
A practical approach: once you know your baby can go until a certain time without eating (say, 4 a.m.), don’t offer a feed before then. If they wake before that time, give them space to resettle on their own. Don’t respond to low-level fussing, only to genuine distress or hunger cries. Over time, sleep training naturally leads to fewer night feeds because your baby is no longer waking out of habit.
The most important rule is that your baby should go into the crib wide awake at bedtime, not drowsy. If they can fall asleep independently at the start of the night, they’re far more likely to resettle themselves when they wake between sleep cycles later.
Realistic Timeline
Full extinction methods can show results in as few as 3 to 4 days. The Ferber method typically takes about a week. Fading and chair methods take closer to two weeks, sometimes longer. “Results” doesn’t mean your baby will never cry again at bedtime. It means the crying decreases dramatically and your baby can fall asleep without your help most nights.
Expect the second or third night to be the hardest, regardless of method. Many parents see a burst of increased protest before things improve. This is normal and not a sign that the method isn’t working.
When to Pause
If your baby gets sick during sleep training, use your judgment. A minor sniffle is usually fine to push through. A stomach bug with vomiting or diarrhea means you should stop and provide whatever comfort your baby needs. You can resume once they’ve recovered, typically within one to two weeks.
Other reasons to pause: travel that disrupts the sleep environment, a new developmental milestone like learning to stand in the crib, or a situation where caregivers can’t maintain consistency. It’s better to pause and restart cleanly than to be inconsistent, because inconsistency teaches your baby that crying long enough eventually gets a response.