Sleep

Cry It Out vs. Ferber: What the Research Says

Both "cry it out" and the Ferber Method are ways of helping a baby learn to fall asleep without help from a parent, and the research on them is more reassuring than the internet debate around them suggests.

By the Nooma Editorial Team 9 min read Reviewed July 8, 2026 All ages

A parent sitting on the floor outside a nursery door, listening, calm and resolved

Safe sleep reminder: Always place baby on their back to sleep, on a firm, flat sleep surface in their own crib, bassinet, or play yard, with a fitted sheet only and no loose blankets, pillows, bumpers, stuffed animals, or other soft items.

What “cry it out” actually means

“Cry it out,” often shortened to CIO, is really an umbrella term. At its core, it means putting your child in their sleep space while they’re still awake and letting them fall asleep on their own, without being rocked, fed, or held through the process. It’s most often reached for when a baby has developed a strong sleep-onset association — needing a specific thing, like nursing or bouncing, to drift off — and a parent wants to build the skill of falling asleep independently instead.

Within that umbrella, there are two main flavors:

Total extinction — your child is placed down awake and you don’t return to the room until a set morning wake time, aside from a genuine concern that they’re sick or hurt.
Graduated extinction — also called check-and-console, controlled comforting, or controlled crying — you leave the room but return for brief check-ins at intervals that get progressively longer. This is the gentler-feeling middle ground, and it’s the category the Ferber Method belongs to.

The Ferber Method, step by step

The Ferber Method takes its name from Dr. Richard Ferber, whose book Solve Your Child’s Sleep Problems laid out the best-known version of graduated extinction. The idea is straightforward even if the execution takes nerve: you put your child down awake, leave the room, and return for short, calm check-ins at increasing intervals rather than staying away entirely.

A typical first-night rhythm looks like this:

Check-in	Approximate wait
1st	~3 minutes
2nd	~5 minutes
3rd onward	every ~10 minutes until asleep

Each subsequent night, the wait intervals are stretched a bit longer, so your child is building more independent-settling time as the days go on. Whatever the exact numbers you’re using, the check-in itself always plays the same, small role: step in, offer a brief word or a hand on the back to let your child know you’re there, and step back out. It isn’t a chance to pick them up, nurse them, or stay until they’re asleep — a longer visit tends to work against the goal, because it reintroduces the very help you’re trying to fade out.

One detail that trips people up: the sequence restarts each time your child wakes overnight. If they resettle after the first stretch of crying but wake again two hours later, you begin again at the shortest interval (often that 3-minute mark) and work back up — you don’t pick up where you left off.

As a general stopping point, checks continue until roughly 5:00–6:00 AM. After that hour, it tends to get harder for a child to fall back asleep, so it’s usually kinder — and more effective — to start the day rather than keep cycling through checks.

What to expect, night by night

The first one or two nights are almost always the hardest and most tiring for parents — this is the part nobody’s memory is kind about. Real, encouraging change is typical by the third or fourth night. If you’re a week in and things genuinely haven’t improved, that’s a signal to step back and reconsider what might actually be driving the wakings (a growth spurt, illness, a schedule that’s out of step with your baby’s sleep needs, teething) rather than pushing the same approach harder.

Night feedings: don’t cut them cold

If your baby is still waking for a substantial feeding overnight, the Ferber Method isn’t meant to eliminate that feeding abruptly. Extra or comfort-only feedings (the quick snack that’s more about soothing than hunger) are the ones to phase out first. Weaning a real night feeding too early — before your baby is physically ready — can backfire, contributing to earlier morning waking or even affecting weight gain. Many babies still benefit from keeping one or two night feedings in place until they can comfortably go without eating overnight. If you’re unsure whether your baby is ready to drop a night feeding, that’s a good question for your pediatrician.

When to start

Age matters here, and the guidance leans conservative. Dr. Ferber himself recommends not starting before 4–6 months — newborns simply aren’t expected to be able to navigate a night waking on their own yet. A more cautious marker sometimes used is 6 months, since a baby’s circadian rhythm isn’t fully mature for sleeping through a full night until around that point, and younger babies may genuinely still need a caregiver’s help to fall back asleep. For cry-it-out generally, many families wait until 5–6 months to start at bedtime, and hold off until 6 months for using it during middle-of-the-night wakings specifically — checking in with a pediatrician along the way about whether night feeding can start to taper.

Softening the approach

Ferber-style training isn’t all-or-nothing. Families who want a gentler on-ramp have a few reasonable adjustments available:

Shorten the wait intervals (say, 1, 3, and 5 minutes instead of 3, 5, and 10).
Start with bedtime only, and leave night wakings for a later step once bedtime feels solid.
If room-sharing, speak reassurance from your own bed instead of walking over each time.
If bed-sharing, stay still and quietly unresponsive rather than getting up.

Naps

The same check-in structure can be used for naps, with one practical adjustment: if your child is still awake and upset after about 30 minutes, it’s reasonable to end the attempt rather than continue indefinitely. Naps are a smaller sleep-pressure environment than nighttime, so a long stretch of crying without resolution isn’t doing the job it would at bedtime.

Toddlers and older children

The Ferber Method isn’t just for infants in a crib — it works for toddlers and preschoolers too. For a child who has moved to their own bed, a doorway gate can effectively turn the bedroom into a large, safe version of a crib, keeping them contained without a locked door. If you’re setting up a room this way, it’s worth childproofing thoroughly first: anchor furniture that could tip, cover electrical outlets, and secure window-covering cords out of reach. And whatever age you’re starting at, make sure the basics of safe sleep are already in place before that first bedtime placement — back to sleep, a firm flat surface, and nothing soft or loose in the sleep space.

What the research actually shows

This is the part that tends to worry parents most, so it’s worth being specific about it. A 2006 review by the American Academy of Sleep Medicine looked at 52 studies of behavioral sleep treatments — including both total and graduated extinction — and found clear evidence that they meaningfully help babies fall asleep and stay asleep, along with real reductions in bedtime resistance and night waking. That same review checked the studies that reported on secondary effects specifically for unwanted side effects and found none; if anything, infants who went through sleep training were rated as more secure, more predictable, less irritable, and less prone to fussing afterward.

Two longer-term studies add to that picture. A cited 5-year follow-up of a behavioral sleep intervention found no marked lasting effects either way — not harmful, not uniquely beneficial in the long run, just a tool that reliably eases a short- to medium-term burden for families. A separate 2020 study following babies through graduated extinction found no difference in attachment security afterward, with no adverse effects on attachment or behavior by 18 months. The research so far hasn’t found lasting harm from Ferber-style sleep training.

It’s also worth naming the biology behind why this feels so hard in the moment: cortisol, a stress hormone, does rise while a baby cries during training — but it also rises when a baby is simply past their sleep window. Sleep deprivation itself carries its own well-documented costs for both babies and parents, which is part of why better infant sleep is consistently linked to improved family well-being, including meaningfully better maternal mental health.

Before you begin

A little preparation goes a long way toward making the process shorter and less distressing for everyone:

A calm, consistent bedtime routine your child already recognizes
A safe sleep space, set up per the guidelines above
A recently fed baby with a dry diaper and comfortable clothing
A schedule that fits your baby’s age, so you’re not starting at a moment when they’re past their sleep window (which tends to increase crying, not reduce it)
A video monitor running, so you can see your child is safe throughout — this matters even more once they’re old enough to pull up to standing

Why consistency matters more than which method you pick

Extinction-based methods are genuinely harder to stick with than they sound on paper, because parents are wired to respond to a crying child — that’s not a flaw, it’s biology. The most common way these methods stall isn’t the method itself; it’s inconsistency, where a parent intervenes differently night to night and inadvertently teaches a child that crying longer sometimes works. Applying a method to the whole night right away (rather than starting at bedtime only) can also mean more initial sleep loss and a few rockier days — more waking, more daytime clinginess, trickier naps — before things settle. How long any individual baby cries varies a lot by temperament and how tired they are going in: some fuss for under 10 minutes, others cry for a stretch on the first night or two, and crying tends to run longer when check-ins are less consistent or more frequent than planned.

Gentler alternatives, if extinction isn’t the right fit

Not every family wants — or is ready for — a method built around crying, and that’s a completely reasonable choice. A few gentler approaches worth knowing about:

Fading — gradually reducing your involvement over a few weeks or more (rocking with less motion, then holding without rocking, then not holding at all) until your baby falls asleep unaided.
Positive routines with a faded bedtime — starting with a bedtime that matches when your child is naturally sleepy, then gradually moving it earlier.
Extinction with parental presence — staying in the room without physical contact, so your child isn’t alone but also isn’t relying on being held or rocked.
Pick-up/put-down — placing your baby down drowsy but awake, picking them up briefly to soothe if they get upset, then putting them back down and gradually stretching the wait and shortening the soothing. This one tends to suit younger infants especially well.
The chair method — sitting in a chair near your child’s sleep space, offering occasional reassurance without picking them up, then moving the chair closer to the door and eventually out of the room over about a week. It’s a gradual approach that often moves faster than fading.

Is cry it out / Ferber the right fit for your family?

Extinction-based methods tend to suit a healthy baby over about 6 months whose sleep struggles are rooted in a sleep-onset association, whose parents are comfortable with some crying once all needs are genuinely met, and who’d rather make a bigger change over a shorter stretch of nights than a slow, gradual shift. If that doesn’t describe your family, one of the gentler alternatives above may be a better starting point — there’s no single “right” method, only the one you can carry through consistently.

A couple of last notes worth holding onto: babies can be noisy sleepers, and a cry-out or fuss in the middle of otherwise-asleep sleep is normal — it’s fine to give a few minutes to see if they resettle on their own before assuming something’s wrong. And if, partway through, the process feels like too much for your family, it is completely fine to pause. You can take a break and try again later, or switch to a gentler approach entirely. Nothing about stopping undoes progress you’ve already made, and there’s no prize for pushing through a method that isn’t working for your household right now.

Sources

Written from primary pediatric sources. This is general information, reviewed editorially rather than by a clinician — it isn’t a substitute for your pediatrician’s advice about your child.