Most babies resist a pack n play at first because it feels, smells, and sounds different from their usual crib. The good news: a pack n play is one of only four sleep products the American Academy of Pediatrics recommends for safe infant sleep, right alongside full-size cribs, bassinets, and portable cribs. Getting your baby comfortable in one comes down to setting up the sleep surface correctly, recreating familiar sleep cues, and giving your baby low-pressure practice time before it counts.
Set Up a Safe Sleep Surface First
Before worrying about sleep strategies, the pack n play itself needs to be set up properly. Use only the mattress pad that came with the unit. It’s thin on purpose. The firm, flat surface prevents your baby from sinking in, which reduces the risk of suffocation. Aftermarket mattress toppers, extra padding, and head-positioning cushions are all hazards the Consumer Product Safety Commission has specifically flagged. Adding a thicker mattress also creates gaps between the pad and the mesh walls where a baby can become wedged.
Cover the mattress pad with a fitted sheet designed for that specific pack n play model. A properly fitting sheet overlaps the underside of the mattress so it can’t be pulled loose. Never use a crib sheet or adult sheet on a pack n play mattress, as a loose sheet can bunch up around your baby’s face or create an entanglement risk. Nothing else goes inside: no blankets, no pillows, no bumpers, no stuffed animals. Place your baby on their back for every sleep until their first birthday.
Let Your Baby Get Familiar During the Day
The most common mistake parents make is introducing the pack n play for the first time at bedtime, when everyone is already tired and patience is thin. Instead, start during the day. Set the pack n play up in a common area and let your baby spend short, supervised awake periods in it. Put them inside for a few minutes of play while you’re nearby. This lets your baby explore the space without any pressure to fall asleep in it.
Once your baby seems relaxed hanging out in the pack n play while awake, try a nap. Naps are lower stakes than nighttime sleep because you can adjust and try again. Follow your normal pre-nap routine, then place your baby down drowsy but awake. If it doesn’t work the first time, that’s fine. The goal is repeated, positive exposure so the pack n play stops feeling unfamiliar.
Recreate Your Home Sleep Environment
Babies rely on sensory cues to know it’s time to sleep. When those cues disappear, sleep falls apart. The fix is making the pack n play environment feel as close to their crib setup as possible.
Temperature: Keep the room between 68 and 72 degrees Fahrenheit. Pack n plays have mesh sides that allow good airflow, so your baby may actually feel slightly cooler than in a solid-walled crib. Dress them in the same sleepwear or sleep sack they use at home and adjust a layer if the room runs warm or cool.
Darkness: Dim the lights and close shades or curtains when it’s time to settle down. If you’re traveling and can’t control the room lighting well, portable blackout curtains that attach with suction cups work in most situations. Light is one of the strongest signals to your baby’s internal clock, so getting the room dark matters more than most parents realize.
Sound: A portable white noise machine can mask unfamiliar sounds and provide a consistent audio cue your baby associates with sleep. Place it at least seven feet from the pack n play and keep the volume at or below 50 decibels, roughly the level of a quiet conversation. Running it too loud or too close can affect your baby’s hearing over time.
Keep Your Bedtime Routine Identical
Your bedtime routine is the single most portable sleep tool you have. Whatever sequence you follow at home (bath, pajamas, feeding, book, song) should happen in the same order when your baby is sleeping in a pack n play. The routine itself is the signal, not the room. Babies pick up on the pattern quickly, and maintaining it tells their body that sleep is coming even when the surroundings have changed.
Stick as close to your baby’s normal sleep and wake times as you can. Shifting bedtime by more than 30 minutes can throw off their circadian rhythm, which makes an already unfamiliar sleep surface even harder to accept. If you’re crossing time zones, gradually shift the schedule by 15 to 20 minutes per day rather than making a sudden jump.
What to Do When Your Baby Keeps Crying
Some babies protest the pack n play for several nights before they adjust. This is normal. The thinner mattress pad feels different, the mesh walls look different, and if you’re traveling, even the air smells different. A few strategies help shorten the adjustment period.
First, try placing a worn (but clean) shirt of yours under the fitted sheet for a few hours before bedtime, then remove it before putting your baby down. This can leave a faint familiar scent on the sheet. Second, if your baby is used to falling asleep independently in their crib, give them the same opportunity in the pack n play. Standing over the pack n play and constantly intervening can signal that something is wrong, which makes your baby more anxious, not less.
If your baby is under four months, they may need more hands-on soothing. Pick them up, calm them, and place them back down. Repeat as needed. For older babies who are used to self-settling, a brief check-in every few minutes (patting, shushing, then stepping back) often works better than picking them up each time.
Travel Tips That Make a Difference
Set up the pack n play as soon as you arrive at your destination, not right at bedtime. Giving your baby even a couple of hours to see and interact with the space before they need to sleep in it reduces the novelty factor. If possible, place it in a corner or against a wall so it feels more enclosed and less exposed.
Bring the sleep basics from home: your baby’s usual pajamas or sleep sack, their portable sound machine, and a small night light if you typically use one. These consistent cues signal that it’s time to wind down regardless of where you are. For babies over 12 months, a small comfort item like a favorite stuffed animal can also help, though nothing should go in the sleep space for babies under one year.
If you’re staying somewhere for more than a night or two, resist the temptation to bring your baby into bed with you after a rough first night. One night of co-sleeping can reset expectations and make the second night in the pack n play even harder. Consistency, even when it’s exhausting, pays off faster than switching strategies.
When to Stop Using a Pack N Play for Sleep
Most pack n plays have a height limit of 35 inches. Many also list a weight limit of 30 pounds, though models with the mattress on the ground floor sometimes have no weight cap. The real limit isn’t a number on a sticker. Once your child can climb out of the pack n play, it’s no longer safe for unsupervised sleep, regardless of their age, weight, or height. For most children, this happens somewhere between 2 and 3 years old, but some adventurous toddlers figure it out earlier. If you see your child pulling themselves up to the top rail and swinging a leg over, it’s time to transition.