Sleep training teaches a baby to fall asleep independently, without being rocked, fed, or held to sleep. Most babies are developmentally ready between four and six months of age, and the process typically takes one to two weeks of consistent effort. There are several proven methods, ranging from minimal parental involvement to hands-on soothing, so you can choose the approach that fits your comfort level.
When Your Baby Is Ready
Babies aren’t born with an internal clock that distinguishes day from night. Their circadian rhythms don’t begin developing until around two to four months and aren’t fully established until at least twelve months. That biological reality is why most babies aren’t developmentally ready to sleep through the night until around six months.
The sweet spot to start encouraging self-soothing is between four and six months. Before four months, the brain simply isn’t mature enough. After six months, separation anxiety starts to emerge, which can make the process harder. Your baby should also be healthy and growing well. If your baby is in the middle of teething, a growth spurt, illness, or a big change like travel, it’s better to wait until things settle down.
Set Up the Right Sleep Environment
Before you start any method, the sleep space needs to be safe and consistent. The American Academy of Pediatrics recommends placing babies on their backs in their own sleep space, using a crib, bassinet, or portable play yard with a firm, flat mattress and a fitted sheet. Keep loose blankets, pillows, stuffed toys, bumpers, and any other soft items out of the crib. Babies should never sleep on a couch, armchair, or in a swing.
Room temperature matters more than most parents realize. Keep the nursery between 68 and 72 degrees Fahrenheit (20 to 22 Celsius). A room that’s too warm increases restlessness and raises safety concerns. Dress your baby in a sleep sack or footed pajamas rather than adding blankets.
Build a Bedtime Routine First
Every sleep training method works better when it’s anchored to a predictable bedtime routine. This doesn’t need to be elaborate. A simple 20 to 30 minute sequence, the same steps in the same order every night, signals to your baby’s brain that sleep is coming. A typical routine might look like: bath, diaper change, pajamas, feeding, a short book or song, then into the crib drowsy but awake.
That last part, “drowsy but awake,” is the foundation of all sleep training. The goal is for your baby to be placed in the crib while still conscious, so they learn to bridge the gap between drowsiness and sleep on their own. If they always fall asleep in your arms and then wake up alone in a crib, they’ll cry because their environment changed without warning.
Graduated Check-Ins (The Ferber Method)
This is the most widely known approach. You put your baby down awake, leave the room, and wait a set amount of time before briefly checking in. On the first night, you might wait three minutes before your first check-in. After a brief reassurance (patting, shushing, but not picking up), you leave and wait a longer interval, maybe five minutes. Then ten. The intervals grow longer with each round and with each passing night.
There’s no single “correct” set of intervals. Some families start with 3, 5, and 10 minutes. Others prefer 10, 20, and 30. What matters is that the wait time between check-ins gets progressively longer, teaching your baby that you’re nearby but that they need to do the work of falling asleep. Check-ins should be brief, around one to two minutes. The point is reassurance, not re-engagement. If picking your baby up during a check-in seems to escalate the crying rather than calm it, try just placing a hand on their chest and speaking softly.
Most families see significant improvement within three to five nights, with the hardest crying concentrated on nights one and two. Night three often brings a noticeable drop in protest. Consistency is everything here. If you go in and pick the baby up on night two because the crying feels unbearable, you’ve effectively taught them that extended crying works, and the next attempt will be harder.
The Chair Method
If leaving the room feels too abrupt, the chair method lets you stay present while gradually reducing your involvement. After your bedtime routine, place the baby in the crib awake and sit in a chair right next to the crib. You can offer gentle verbal reassurance, but avoid picking them up or making eye contact that stimulates interaction.
Every few nights, move the chair a bit farther from the crib. The progression goes from beside the crib, to the middle of the room, to near the door, to just outside the door, and eventually you’re gone entirely. This method is slower, often taking two to three weeks, but it can feel more manageable for parents who struggle with hearing their baby cry alone. The tradeoff is that your presence can sometimes be stimulating for the baby, making it harder for them to settle.
Pick Up, Put Down
This is the most hands-on option. You place your baby in the crib awake. If they start to fuss or cry, you pick them up and soothe them. But as soon as their eyelids start to droop, you set them back down in the crib before they actually fall asleep. If they cry again, you repeat the cycle: pick up, soothe, put down drowsy.
The rhythm can feel exhausting, and on the first few nights you might repeat the cycle dozens of times. But the underlying lesson is the same as every other method: your baby falls asleep in the crib, not in your arms. This approach works well for younger babies (around four months) and for parents who want maximum physical contact during the transition. It tends to take longer than graduated check-ins, sometimes up to two weeks or more.
Extinction (Cry It Out)
The most straightforward and often fastest method. You complete your bedtime routine, place the baby in the crib awake, say goodnight, and leave. You don’t return until the next scheduled feeding or until morning. There are no timed check-ins.
This method gets the most resistance from parents, but it often produces results in as few as three nights. It works because there’s no intermittent reinforcement. The baby isn’t receiving periodic visits that restart their arousal cycle. For some babies, check-ins actually prolong crying because each parental appearance gives them renewed hope of being picked up. If that describes your baby, full extinction may actually involve less total crying over the course of training than a graduated approach.
What About Stress and Attachment?
The most common concern parents have is whether letting a baby cry damages them emotionally. Research on infant cortisol (the body’s primary stress hormone) and sleep has found that toddlers who sleep well actually tend to have healthy, normal morning cortisol patterns, which are associated with better cognitive and language development. The brief stress of sleep training has not been linked to attachment problems or long-term emotional harm in the studies that have followed children over time.
This doesn’t mean it feels easy. Hearing your baby cry is biologically designed to be distressing for you. But the crying is a protest against a change in routine, not a sign of harm. Most babies cry less each successive night, and within a week the protests at bedtime are minimal or gone.
Why It Stops Working (and How to Fix It)
The most common reason sleep training fails is inconsistency. If one parent does check-ins and the other picks the baby up, or if you follow the plan for three nights and then co-sleep on the fourth, the baby receives mixed signals and the process resets. Both caregivers need to agree on the method and commit to it for at least a full week.
Regressions are normal and don’t mean the training failed. Illness, travel, teething, and developmental leaps (learning to stand, separation anxiety around eight to ten months) can temporarily disrupt sleep. When the disruption passes, you may need to re-train for a night or two, but it goes much faster the second time because the skill is already partially learned.
Night feedings are a separate question from sleep training. Many babies still need one or two feeds overnight at four to six months. Sleep training addresses how the baby falls asleep, not whether they eat at night. You can sleep train while keeping a dream feed or a scheduled overnight feed. The key is that when the feed is done, the baby goes back into the crib awake.
Choosing the Right Method
There is no single best method. The best one is the one you can follow through on consistently. If you know you can’t listen to crying without intervening, pick up/put down or the chair method will serve you better than extinction, even if they take longer. If your baby seems to get more agitated when you’re in the room, graduated check-ins or full extinction may actually be gentler in practice because they result in less total crying.
Whatever you choose, give it at least five to seven consecutive nights before deciding it isn’t working. The first two nights are almost always the hardest. Progress isn’t always linear: night three might be better, night four slightly worse, and night five a breakthrough. Track the total minutes of crying each night. Even when it doesn’t feel like it, the trend is usually clearly downward when you look at the numbers.