Getting an infant to sleep in a crib comes down to two things: making the crib feel safe and familiar, and helping your baby learn to fall asleep there rather than in your arms. Most babies resist the crib at first because it feels open and unfamiliar compared to being held or sleeping in a smaller bassinet. The good news is that a few consistent strategies can make the transition smoother, often within one to two weeks.
Start With the Right Sleep Environment
Before working on any sleep habits, the crib itself needs to be set up correctly. The mattress should be firm and flat with only a fitted sheet on it. No blankets, pillows, stuffed animals, or bumper pads. The AAP is clear on this: the sleep space should be completely empty aside from your baby and the sheet. A bare crib might look sparse, but it’s the safest setup.
Room temperature matters more than most parents realize. Keep the nursery between 68 and 72 degrees Fahrenheit. Babies can’t regulate their body temperature as well as adults, so a too-warm room often causes restlessness. Dress your baby in a sleep sack or wearable blanket appropriate for the temperature rather than adding loose layers.
If you use a white noise machine, keep the volume below 50 decibels, which is roughly the level of a quiet conversation. Place it across the room from the crib rather than right next to your baby’s head. White noise can help mask household sounds that startle light sleepers, but it shouldn’t be loud enough to risk hearing damage over time.
Put Your Baby Down Drowsy, Not Asleep
This is the single most repeated piece of advice from pediatric sleep experts, and for good reason. When you rock, nurse, or bounce your baby fully to sleep and then transfer them to the crib, they often wake during the transfer and need you to start the whole process over. Worse, if they wake between sleep cycles later in the night, they don’t know how to get back to sleep without that same rocking or nursing.
The goal is to lay your baby down when they’re clearly sleepy (rubbing eyes, yawning, getting fussy) but still slightly awake. This lets them practice the skill of falling asleep in the crib. It won’t work perfectly the first time. Your baby may fuss or cry for a few minutes before settling. Give them a short window to work through it before stepping in, then comfort them briefly and try again.
Use Wake Windows to Time It Right
One of the most common reasons a baby fights the crib is simply being put down at the wrong time. Too awake and they’ll protest. Too overtired and they’ll be wired and irritable, making it even harder to settle. Wake windows, the stretch of time your baby can comfortably stay awake between sleeps, are a reliable guide:
- Newborn to 1 month: 30 minutes to 1 hour
- 1 to 3 months: 1 to 2 hours
- 3 to 4 months: 1.25 to 2.5 hours
- 5 to 7 months: 2 to 4 hours
- 7 to 10 months: 2.5 to 4.5 hours
- 10 to 12 months: 3 to 6 hours
These ranges are wide because every baby is different, but they give you a starting point. Watch for sleepy cues as you approach the end of the window. If your baby is calm and alert, they probably need a bit more awake time. If they’re zoning out or getting cranky, it’s time.
Build a Short, Consistent Bedtime Routine
A bedtime routine doesn’t need to be elaborate. Three to four calming activities in the same order each night are enough to signal to your baby that sleep is coming. A bath, a feeding, a book or quiet song, and then into the crib works well for most families. The key is consistency: doing the same steps in the same order helps your baby’s brain start to associate these cues with winding down.
Keep the room dim and your voice low and soothing during the routine. Avoid stimulating play in the 20 to 30 minutes before bed. The contrast between active time and quiet time helps your baby shift gears. Over days and weeks, this routine becomes a powerful sleep cue on its own.
Transition Gradually if Needed
If your baby has been sleeping in a bassinet next to your bed, in a swing, or in your arms, going straight to the crib in a separate room can be a big leap. A gradual approach often works better.
Start by using the crib for naps during the day while keeping the bassinet for nighttime. This lets your baby spend time in the crib during lower-stakes moments when you’re more alert and patient. Once naps in the crib are going reasonably well, move nighttime sleep there too. Some parents find it helps to move the crib into their room temporarily before eventually moving it to the nursery, breaking the change into two smaller steps instead of one big one.
If your baby has been falling asleep in a swing or car seat, this transition is especially important. Babies should not sleep regularly in seated devices because the position can restrict their airway. The flat, firm surface of a crib is the safest option for any sleep longer than a few minutes.
Know When to Stop Swaddling
Swaddling can help newborns feel snug in a crib, but it has an expiration date. Once your baby shows any signs of trying to roll over, you need to stop swaddling immediately. A swaddled baby who rolls onto their stomach may not be able to roll back, which creates a suffocation risk. For most babies, this happens somewhere between 2 and 4 months.
The transition from swaddle to sleep sack can temporarily disrupt crib sleep because your baby loses that cozy, contained feeling. A sleep sack with open arms gives them the warmth of a blanket without the danger of loose fabric, and most babies adjust within a few nights.
Expect Setbacks at Predictable Ages
Even after your baby is sleeping well in the crib, certain developmental stages can cause temporary disruptions. Around 6 months, many babies start waking more at night as part of normal separation anxiety development. This phase tends to be most intense between 9 and 18 months and then gradually fades.
During these periods, your baby may cry when placed in the crib or wake up calling for you more often. It’s tempting to abandon the crib entirely and bring them into your bed, but this usually makes the transition harder to redo later. Instead, offer brief comfort (a pat, a quiet voice) and keep the routine consistent. These regressions are temporary, typically lasting one to three weeks, and babies who have already learned to fall asleep in the crib tend to bounce back faster.
What to Do When Nothing Seems to Work
Some babies take longer than others. If you’ve been consistent for two weeks or more and your baby still screams the moment they touch the crib mattress, check the basics first. Is the room the right temperature? Is the mattress firm and flat? Are you catching the right wake window? Sometimes a small adjustment, like putting your baby down 15 minutes earlier, makes a surprising difference.
You can also try warming the crib sheet with a heating pad before placing your baby down (remove the pad before the baby goes in). The shock of a cold sheet against warm skin is enough to wake some babies during the transfer. Placing a worn shirt of yours near the crib, but not inside it, can also help your baby feel your presence in the room.
If your baby is older than 4 months and still unable to sleep in the crib despite consistent effort, a more structured sleep training approach may help. Methods range from gentle (staying in the room and gradually moving farther from the crib over several nights) to more direct (leaving the room and checking in at timed intervals). The right approach depends on your baby’s temperament and your own comfort level, and all of them work better when the bedtime routine and sleep environment are already solid.