Getting a baby to sleep in a crib comes down to three things: a consistent routine, the right environment, and a gradual approach that teaches your baby the crib is a safe, familiar place. Most families can make this transition in one to two weeks with a clear plan.
Set Up the Crib for Safe, Sound Sleep
Before working on any sleep habits, the crib itself needs to be right. Use a firm, flat mattress with only a fitted sheet on it. No blankets, pillows, stuffed animals, or bumper pads. The Consumer Product Safety Commission now requires all crib mattresses to pass a firmness test, since soft mattresses have been linked to infant deaths. When you press your hand into the center of the mattress, it should snap back immediately rather than conform to the shape of your hand.
You may have seen “breathable” crib mattresses marketed as safer options. According to the AAP, there’s no epidemiological evidence that breathable mattresses actually protect against SIDS. A standard firm mattress that meets current safety standards is all you need.
Keep the room between 68 and 72°F (20 to 22°C). Overheating is directly linked to SIDS, so dress your baby in one layer more than you’d wear comfortably, and skip heavy sleep sacks in warmer months. A good test: feel the back of your baby’s neck or chest. If the skin is hot or sweaty, remove a layer.
Build a Predictable Bedtime Routine
A bedtime routine should run about 30 to 45 minutes and follow the same sequence every night. The specific activities matter less than the consistency, but a typical flow might look like this: bath, pajamas, feeding, a short book or song, then into the crib. Dimming the lights during this routine signals your baby’s brain to start producing melatonin, the hormone that drives sleepiness.
What happens earlier in the day matters too. Getting your baby outdoors in natural daylight, especially in the morning, helps regulate their internal clock and boosts melatonin production at night. For older babies eating solids, a supper that includes carbohydrates (cereal, bread, rice with milk) also supports melatonin release before bed.
Master the Crib Transfer
The most common complaint parents have is that the baby falls asleep in their arms and then wakes up the instant they hit the mattress. This is almost always the Moro reflex, the involuntary startle response babies are born with. When a baby’s head drops backward or their body senses a sudden change in position, their arms fling out and they jolt awake. This reflex peaks in the first month and typically fades by around two months of age.
To work around it, lower your baby into the crib feet first. Let their feet touch the mattress, then gently roll them down: feet to bottom, stomach, and finally neck and head, keeping your hand supporting the back of their head the entire time. This slow, sequential contact avoids the sudden “falling” sensation that triggers the startle. For babies under two months, a snug swaddle keeps the arms contained and dramatically reduces the reflex. Once your baby starts showing signs of rolling, the swaddle needs to stop for safety.
The larger goal, though, is to eventually skip the transfer entirely. Putting your baby down “drowsy but awake” is the single most effective habit for long-term crib sleep. This means ending your bedtime routine while your baby is calm and sleepy but still has their eyes open. It teaches them to fall asleep in the crib rather than in your arms, which means they can also put themselves back to sleep when they wake between sleep cycles at night.
Choose a Sleep Training Approach
If your baby cries when placed in the crib awake, a structured approach helps. Two of the most widely used methods work well for crib transitions.
Graduated check-ins (the Ferber method): Place your baby in the crib awake, leave the room, and return to briefly reassure them at increasing intervals. You might check at 3 minutes, then 5, then 10. You don’t pick the baby up during checks. You simply let them hear your voice, give a brief pat, and leave again. Most families see significant improvement within 7 to 10 days.
The chair method: Sit in a chair right next to the crib while your baby falls asleep. Each night, move the chair a little farther away. Over the course of a week or two, you gradually work your way out of the room. This method is slower but involves less crying, which some parents find easier to sustain.
Both methods work. The best one is whichever you can follow through on consistently. Switching approaches mid-course or giving in after 40 minutes of crying on night three actually extends the process, because the baby learns that enough protest will change the outcome.
Handle Sleep Regressions and Separation Anxiety
Even babies who sleep beautifully in the crib will have rough patches. The most disruptive period tends to hit between 10 and 18 months, when separation anxiety peaks. During this phase, babies who previously slept through the night may start waking and crying, or refuse to go to sleep unless a parent is nearby. This is a normal developmental stage, not a sign that sleep training failed.
The instinct during a regression is to pull the baby back into your bed or start rocking them to sleep again. This will get you through the night, but it can undo weeks of progress. A better approach is to offer brief comfort in the crib without changing the routine. Go in, reassure with your voice and a hand on the chest, and leave. The regression typically passes on its own, usually within two to three weeks, if you hold the boundary.
Transitioning From a Bassinet or Your Bed
If your baby has been sleeping in a bassinet in your room, start by placing the crib in your bedroom for a few nights. The AAP recommends room sharing (not bed sharing) for at least the first six months. Having the crib nearby lets your baby adjust to the new sleep surface while still sensing your presence. Once they’re sleeping well in the crib, you can move it to their own room.
If you’re transitioning from co-sleeping in your bed, the shift is bigger. Start with naps in the crib during the day, when sleep pressure is high and the emotional stakes feel lower for both of you. Once your baby can nap reliably in the crib, move nighttime sleep there. Expect the first three nights to be the hardest. By nights four and five, most babies have started adjusting.
For the first few nights in any transition, placing a worn (not freshly laundered) shirt of yours near the outside of the crib, where the baby can smell it but not reach it, can ease the adjustment. Your scent is one of the strongest comfort signals your baby has.
What Success Actually Looks Like
Realistic expectations make this process survivable. “Sleeping through the night” for an infant means a stretch of about five to six hours, not eight or ten. Babies wake between sleep cycles naturally. The goal of crib sleep training isn’t to eliminate all waking. It’s to help your baby fall back asleep independently when those normal wakings happen, instead of needing to be picked up, rocked, or fed each time.
Most families see noticeable improvement within a week and more consistent stretches within two to three weeks. Some nights will be worse than others, especially during teething, illness, or developmental leaps. That doesn’t mean you’re back to square one. Return to the routine, stay consistent, and the pattern reasserts itself quickly when the disruption passes.