There is no single “best” sleep training method. The best method is the one you and your partner can follow consistently until it becomes habit. That’s not a cop-out answer. Research shows that all major sleep training approaches work, with 94% of studies on behavioral sleep interventions reporting them as effective and producing meaningful improvement in more than 80% of children. The real difference between methods is how fast they work and how much crying is involved, which means the right choice depends on what you can actually stick with.
Why Consistency Matters More Than the Method
Sleep training works by teaching your baby to fall asleep independently. Every method shares the same core principle: your baby needs to make the transition from awake to asleep on their own, in their crib, without being rocked, fed, or held to sleep. The specific technique you use to get there matters less than whether you follow through night after night.
A large randomized trial of 235 infants found that sleep training cut the number of babies waking two or more times per night roughly in half (31% vs. 60% in the control group). Those gains showed up regardless of which method families used. But the parents who saw the best results were the ones who stayed consistent. Roughly 75% of parents who try controlled crying either never finish or stop partway through, mostly because the emotional toll is too high. Choosing a method you can tolerate is the single most important decision you’ll make.
Graduated Extinction (the Ferber Method)
This is the most widely recommended approach. You put your baby down drowsy but awake, leave the room, and wait a set number of minutes before briefly checking in. You don’t pick the baby up. You offer a few seconds of reassurance, then leave again. Each time, the interval gets longer.
On the first night, the initial wait is about three minutes. The second night, you start at five. Some families use 10-minute intervals increasing to 20, then 30. The exact numbers are flexible. What matters is that the gaps between check-ins grow over time, giving your baby progressively more opportunity to settle independently. Most families see significant improvement within seven to ten days.
Full Extinction (Cry It Out)
This is the most straightforward and fastest method. You complete your bedtime routine, place your baby in the crib awake, say goodnight, and don’t return until morning (or until a scheduled feeding, if your baby still needs one). There are no check-ins.
It tends to work in as little as three to four days. But the early nights can be rough. One study found that baseline crying of 35 to 40 minutes actually doubled to over 70 minutes during the first two nights before it started dropping. And not every baby responds within a few nights. Some take three weeks or more for awakenings and crying to reliably decrease. Parents often find this method more stressful than graduated approaches, which is why so many abandon it partway through. If you can commit fully, it’s effective. If you think you might give in at the 45-minute mark, graduated extinction will likely get you better results in the end.
Pick Up, Put Down
This is a gentler option for parents who aren’t comfortable with extended crying. When your baby fusses or cries, you pick them up and comfort them. As soon as you see their eyelids start to droop, you set them back in the crib before they fall asleep. If they cry the moment their head touches the mattress, you start the cycle again.
The goal is the same as every other method: your baby learns to make that final shift from drowsy to asleep while alone in the crib. The tradeoff is time. Gentler methods like this one can take up to four weeks to produce consistent results, and you may spend long stretches repeating the pick-up cycle in a single night. It works well for younger babies and for parents who need to stay physically involved in the process to feel comfortable.
The Chair Method
With this approach, you sit in a chair next to the crib while your baby falls asleep. You don’t pick them up, but your presence is reassuring. Every few nights, you move the chair farther from the crib until you’re eventually outside the room. Like pick up, put down, this is a slower method. Expect up to four weeks. It’s a good fit for parents who want to be present but are comfortable not intervening physically.
When to Start
You can begin laying the groundwork as early as two months by establishing a consistent bedtime routine and placing your baby in the crib drowsy but awake. This isn’t formal sleep training yet. It’s building the association between the crib and falling asleep.
Most pediatric guidelines recommend starting structured sleep training around four to six months, when babies are developmentally capable of longer sleep stretches and have less physiological need for nighttime calories. If your baby was born prematurely, use their adjusted age. And if your baby still needs nighttime feeds (many do well past six months, especially breastfed babies), you can absolutely sleep train while preserving one or two scheduled feeds. Sleep training addresses how your baby falls asleep, not whether they eat overnight.
What About Long-Term Effects?
This is the worry that keeps many parents up at night, on top of the baby keeping them up. The evidence is reassuring. A five-year follow-up of a randomized trial involving 225 families found no differences between sleep-trained and non-sleep-trained children on any of 20 measured outcomes, including emotional behavior, conduct, sleep habits, psychosocial functioning, stress regulation, and the quality of the parent-child relationship. Parenting style and maternal mental health were also equivalent between the two groups.
Cortisol measurements tell a similar story. A controlled trial that tracked infant stress hormones found that babies in both the graduated extinction and bedtime fading groups actually showed small-to-moderate declines in cortisol compared to the control group. Sleep training did not increase physiological stress. It decreased it, likely because the babies were sleeping better. A separate follow-up confirmed no differences in attachment style or behavioral problems between sleep-trained and non-trained groups.
Meanwhile, the benefits for parents are well documented. In one trial, mothers in the sleep training group had significantly fewer depression symptoms at two years (15% vs. 26%), along with improved fatigue, sleep quality, and mood scores. A rested parent is a more patient, more present parent.
Practical Tips That Apply to Every Method
- Set a consistent bedtime routine. A predictable sequence of bath, pajamas, feeding, book, and crib signals to your baby’s brain that sleep is coming. Do the same steps in the same order every night.
- Put your baby down awake. This is the non-negotiable element across all methods. If your baby falls asleep in your arms and wakes up alone in the crib, they’ll cry for you because their environment changed. Falling asleep in the crib teaches them that waking up in the crib is normal.
- Pick your start date carefully. Don’t begin during travel, illness, teething, or a major transition like starting daycare. You want at least two stable weeks to establish the new pattern.
- Get on the same page with your partner. If one parent gives in and the other doesn’t, the inconsistency teaches your baby that crying long enough works. Decide together what you’ll do before the first night.
- Expect some regression. Illness, travel, and developmental leaps can temporarily disrupt sleep even after successful training. When things settle, return to your method. The second round typically goes much faster.
Choosing Your Method
If you want the fastest results and can handle several hard nights, full extinction works in three to four days for many families. If you want a structured middle ground, graduated extinction (Ferber) typically takes seven to ten days and gives you the reassurance of regular check-ins. If you need to stay physically involved and are willing to invest more time, pick up, put down or the chair method will get you there in roughly three to four weeks.
All of these methods lead to the same place: a baby who can fall asleep independently, fewer nighttime wakings, and better sleep for the entire household. The research consistently shows that the outcomes are equivalent across techniques. The only method that doesn’t work is the one you abandon halfway through.