Most babies are ready to start sleep training around 4 months old, once their internal sleep cycles have matured enough to handle longer stretches of nighttime sleep. The process typically takes about a week to show real improvement, though the exact timeline depends on which method you choose and how consistently you follow it. Here’s what you need to know to get started.
When Your Baby Is Ready
Before 3 months, babies don’t produce their own melatonin or have a functioning internal clock that distinguishes day from night. Their sleep cycles are short and irregular, and they genuinely need to eat overnight. Sleep training a newborn won’t work and isn’t appropriate.
Around 4 months, two things change. First, your baby’s brain begins cycling through distinct stages of light sleep, deep sleep, and active sleep in a more predictable pattern. Second, their circadian rhythm kicks in, meaning their body starts responding to light and dark cues the way yours does. This is also when many babies experience the well-known “4-month sleep regression,” which, despite being frustrating, is actually a sign that their brain is reorganizing its sleep architecture in a healthy way.
A good general benchmark is 4 months old and around 14 pounds. At that weight, many babies no longer need overnight feedings to sustain their caloric needs. Some babies aren’t ready until closer to 6 months, and that’s perfectly normal. If your baby was premature, has a medical condition, or is underweight, talk to your pediatrician about timing.
Set Up the Room First
Sleep training works best when the environment supports good sleep. Keep the room between 68 and 72°F, with humidity in the 30 to 50% range. Use blackout curtains to block light, and consider a white noise machine set at a consistent low volume. The crib should have a firm mattress with a fitted sheet and nothing else: no blankets, pillows, stuffed animals, or bumpers.
Establish a short, predictable bedtime routine that you’ll repeat every night. This might be a bath, a feeding, a book, and a song, in the same order, lasting about 20 to 30 minutes. The routine signals to your baby’s brain that sleep is coming. The final step should always be placing your baby in the crib drowsy but awake. That “drowsy but awake” part is the foundation of every sleep training method.
Graduated Extinction (Ferber Method)
This is the most widely discussed approach. You put your baby down awake, leave the room, and wait a set number of minutes before going back in to briefly comfort them (a pat, a few quiet words) without picking them up. Then you leave again, this time waiting a slightly longer interval before returning.
On the first night, you might start with 3 minutes, then 5, then 10. On the second night, you bump those intervals up: 5, 10, 12. By the third or fourth night, the intervals are longer, and most babies are crying significantly less. The whole process often shows clear improvement within a week. The key is consistency. If you pick your baby up or feed them to sleep partway through, you reset the learning process and extend the timeline.
The Chair Method
If graduated extinction feels too intense, the chair method offers a slower, more hands-on alternative. After your bedtime routine, place your baby in the crib awake and sit in a chair right next to the crib. Stay there, quietly, until your baby falls asleep. You can offer gentle shushing or a hand on their chest, but the goal is minimal interaction.
Every few nights, move the chair a little farther from the crib. First to the middle of the room, then near the door, then just outside the door, and eventually you’re out of the room entirely. This gradual withdrawal gives your baby time to adjust to falling asleep with less and less of your presence. It’s gentler, but it takes longer, often two weeks or more. It also requires patience on your part, because sitting silently in a chair while your baby fusses is harder than it sounds.
Full Extinction (Unmodified Cry It Out)
This is the most direct approach: you complete the bedtime routine, put your baby in the crib awake, say goodnight, and don’t return until morning (or until a scheduled feeding, if your pediatrician says overnight feeds are still needed). There are no check-ins.
It sounds harsh, and the first night or two can be genuinely difficult. But for many families, it produces the fastest results because there’s no ambiguity for the baby. Check-ins can sometimes escalate crying rather than reduce it, because the baby sees you, expects to be picked up, and gets frustrated when you leave again. Full extinction removes that cycle. Research on this method has found no association between its use and problems with parent-child attachment at 18 months, though the topic remains debated among child development experts.
Pick Up, Put Down
This method involves the most parental involvement. When your baby cries, you pick them up and comfort them until they’re calm but not asleep. Then you put them back down. If they cry again, you repeat the process. You do this as many times as needed until they fall asleep in the crib.
It can work well for younger babies (around 4 to 5 months) and for parents who find the other methods too stressful. The trade-off is that it takes the longest to show results, and some babies get more stimulated by being picked up repeatedly, which can backfire. If your baby seems to escalate rather than calm down with this approach, a less hands-on method may be a better fit.
Choosing the Right Method
No single method is objectively better than the others. What matters most is consistency. Switching between methods midway through, or being inconsistent about whether you respond to crying, confuses your baby and drags out the process. Pick the approach that you can realistically follow through on, night after night, even when it’s hard.
Consider your own tolerance for crying. If you know you can’t sit in another room listening to your baby cry for 10 minutes, graduated extinction will fall apart on night two. The chair method or pick up, put down might be more sustainable for you. If you’ve been severely sleep-deprived for months and need the fastest resolution, full extinction or Ferber tends to produce results within a week.
What to Do About Night Feeds
Sleep training and night weaning are two separate things. You can sleep train your baby while still offering one or two overnight feeds if they’re still nutritionally needed. The difference is that you feed at set times (for example, if your baby wakes after midnight) rather than using feeding as a tool to get them back to sleep every time they stir.
If your baby is over 14 pounds and growing well, your pediatrician may confirm that overnight feeds are no longer necessary. In that case, you can drop them during sleep training. If you’re unsure, keep one feed and eliminate it later once sleep training is established.
When to Pause
If your baby gets sick with a fever, ear infection, or stomach bug, stop sleep training and provide whatever comfort they need. Illness changes everything: they’re in pain, they may be dehydrated, and their sleep will be disrupted regardless of training. Wait until they’ve fully recovered before restarting.
Teething is trickier because it can drag on for weeks. Mild teething discomfort doesn’t necessarily require pausing. You can offer a chilled teething ring or cold washcloth before bed and continue with your method. But if your baby is clearly in significant pain, with swollen gums, a low-grade fever, and inconsolable crying that’s distinctly different from their normal protest, it’s reasonable to take a break for a night or two.
Travel, time zone changes, and major disruptions like moving to a new home can also set things back temporarily. Most babies who’ve been successfully sleep trained will return to their routine within a few nights of getting back to normal life. The skill doesn’t disappear; it just needs a brief refresher.
What the First Week Looks Like
Night one is almost always the hardest, regardless of method. Expect crying, possibly for 30 to 60 minutes or more. This is normal and doesn’t mean something is wrong. Night two is often similar, sometimes worse (an “extinction burst” where crying temporarily intensifies before dropping off). By nights three and four, most babies are crying for significantly shorter periods. By the end of the first week, many babies are falling asleep within 10 to 15 minutes of being placed in the crib.
Naps often take longer to consolidate than nighttime sleep. It’s fine to start with nighttime only and tackle naps a week or two later. Some parents find that once nighttime sleep improves, naps naturally get better on their own.