By age

What age can you start the Ferber method?

Never before about 4 months, and 6 months is the most common age to start. Between 4 and 6 months, talk to your pediatrician first.

The Ferber team September 26, 2026 6 min read

Onboarding step asking how old your child is, set to 6 months.

Maybe your baby is 3 months old and you are already counting the wakings. Maybe your baby is 14 months and you are wondering whether you missed the window. Either way, the first question is the same.

The Ferber method should never be started before about 4 months of age, and 6 months is the most common age to start. If your baby is between 4 and 6 months old, talk to your pediatrician before you begin. There is no upper age limit: the method can also work for older babies and toddlers, with a few adjustments. If your baby was born early, ask your pediatrician which age to go by, because it is usually their corrected age.

What age can you start the Ferber method?

Here is how the ages break down:

Under 4 months: too early for the Ferber method or any sleep training.
4 to 6 months: possible for some babies, but only after a conversation with your pediatrician.
6 months and older: the most common time to start, for a healthy baby.
12 months and older: still workable, with changes for a child who stands, climbs and protests out loud.

Age is only the first check. A healthy baby, a settled week ahead and adults who agree on the plan matter just as much. The sections below explain each age band, and the Ferber method, explained covers how the method itself works.

Why not before 4 months

Young babies are still doing a lot of growing, and their sleep is built differently. The Cleveland Clinic explains that newborns have short sleep cycles, usually cannot get through the night without eating, and do not yet know how to self-soothe. Around 4 months, it says, sleep cycles begin to mature and the circadian rhythm starts to take effect.

That is why the Ferber method is not for young babies. In those early months, crying usually means a need: hunger, discomfort, or wanting to be close. Responding to it is the right thing to do.

What you can do is lay some groundwork. The American Academy of Pediatrics (AAP) suggests that for babies 4 months and older, you put them to bed drowsy rather than waiting until they are asleep. A calm, predictable bedtime routine also helps later, when you are ready.

From 4 to 6 months: talk to your pediatrician first

Some babies in this window may be ready, and some are not. The Cleveland Clinic notes that babies differ: some do better a little later, around the 6-month mark, and it advises checking with your pediatrician first.

That conversation covers the things only your pediatrician can judge:

whether your baby is gaining weight well
whether they still need one or more night feeds
any reflux, breathing or other health concerns
whether your baby was born early, and how that changes the timing

If your pediatrician says yes, the method works the same way at 4 or 5 months as it does later. If they say wait, waiting a few weeks is completely fine. Our article on the Ferber method at 4 months goes into this window in more detail.

Why 6 months is a common starting point

The Sleep Foundation notes that by around 6 months many babies can self-soothe and fall back asleep on their own, which makes it an appropriate time to begin sleep training methods like the Ferber method. The AAP notes that it is normal for a 6-month-old to wake in the night and go back to sleep after a few minutes. The Ferber method helps babies practice that second part.

Much of the research also starts here. A randomized trial of graduated extinction (the research term for the Ferber method) enrolled infants aged 6 to 16 months and found the approach reduced how long babies took to fall asleep and how often they woke, with no differences in emotional or behavioral problems or attachment a year later.

Even at 6 months, two questions belong with your pediatrician: whether your baby still needs a night feed, and whether there is any health reason to wait. Our article on the Ferber method at 6 months and the 6-month age guide cover this age in detail.

Premature babies and corrected age

If your baby was born early, their development often tracks their corrected age more closely than their age from birth. The AAP explains how to work it out: take your baby’s age in weeks since birth and subtract the number of weeks they were born early. Its example is a baby born at 32 weeks, 8 weeks early, who at 4 months old has a corrected age of 2 months.

The AAP says corrected age gives a better idea of when to expect developmental milestones during the first 2 years. For sleep training, the decision belongs with your pediatrician, who knows your baby’s history. Ask them directly what age they would like you to use.

Older babies and toddlers

It is not too late at 9 months, 12 months or beyond. The Sleep Foundation says the Ferber method can be effective for toddlers, particularly when it is adapted to their developmental stage.

What changes with age is mostly how your child protests. From the second half of the first year, separation anxiety can make wakings louder and more upset. Older babies often stand in the crib, and toddlers call out, stall and sometimes climb. The core of the method stays the same: timed waits, brief check-ins, and waits that grow over the week.

We have separate articles for these stages: Ferber at 9 months and Ferber at 12 months and older. The age guides cover each band’s practicalities.

Is your baby ready? A next step for tonight

Age is the first gate. After that, readiness looks like a healthy baby who has been well for at least a few days, a week ahead without travel, a daycare start or a house move, and every adult who does bedtime agreeing on the plan. Safe sleep comes first at every age: your baby on their back, on a firm, flat surface in their own crib, with nothing soft in it. The AAP safe sleep guide has the details.

If your baby is under 6 months, your next step is a call or message to your pediatrician’s office. If your baby is 6 months or older and well, pick a start night in a calm week and read the getting started guide.

The Ferber app is designed for babies 6 months and older. It will not start a plan for a baby under 4 months, and for babies between 4 and 6 months it asks you to confirm you have spoken with your pediatrician.

Common questions

What is the earliest age to start the Ferber method?

Not before about 4 months. Six months is the most common age to start. If your baby is between 4 and 6 months old, talk to your pediatrician before starting the Ferber method or any other sleep training.

Is 6 months a good age to start Ferber?

Six months is a common starting point. The Sleep Foundation notes that by around 6 months many babies can self-soothe and fall back asleep on their own, which is the skill the Ferber method builds on. Your baby should also be healthy, and your pediatrician should agree on any night feeds.

Is it too late to start the Ferber method at 1 year or older?

No. The Sleep Foundation says the Ferber method can be effective for toddlers when it is adapted to their stage. Older babies and toddlers may protest louder or stand in the crib, so safety checks like the crib mattress height matter more.

My baby was born early. Which age do I use for Ferber?

Ask your pediatrician. For premature babies, doctors usually use corrected age, which is your baby's age from birth minus the number of weeks they were born early. Your pediatrician can tell you when sleep training makes sense for your baby.

Sources

Written by The Ferber team. Educational information, not medical advice. If you are worried about your child’s health, feeding or growth, talk to your pediatrician.

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