Last Updated on September 16, 2026
If your Pack ’n Play mattress looks thin, firm, or less comfortable than the crib mattress you’re used to, you may wonder whether you can swap it for a thicker crib mattress.
No. A crib mattress should not be added to a Pack ’n Play or other soft-sided playards.
The reason isn’t that crib mattresses are unsafe. A crib mattress can be perfectly appropriate for a compatible crib. The problem is that a Pack ’n Play is designed differently, with flexible sides and a sleep surface that is part of the playard’s overall safety design.
Here’s what to know before adding another mattress or pad.
A Quick Note on Terminology: In this article, we use the terms “Pack ’n Play” and “playard” interchangeably. Pack ’n Play is Graco’s brand name for its line of playards, but the term is also commonly used in the U.S. to refer to this type of portable playard more generally. The safety information and advice in this article apply to playards from all brands, not just Graco.
- Can You Put a Crib Mattress in a Pack ’n Play?
- Why Can't You Use a Crib Mattress in a Pack ’n Play?
- Is the Pack ’n Play Mattress Too Firm?
- What Mattress Should You Use in a Pack ’n Play?
- What About Pack ’n Play Mattresses Sold as “Universal”?
- What If Your Pack ’n Play Mattress Looks Too Small?
- What If You Already Bought a Crib Mattress for Your Pack ’n Play?
- The Bottom Line
- Frequently Asked Questions
Can You Put a Crib Mattress in a Pack ’n Play?
No. You should not put a standard crib mattress in a Pack ’n Play (playard).
The safest starting point is to use the mattress or pad supplied with your Pack ’n Play and follow the manufacturer’s instructions. If you need a replacement, use one that is specifically identified as compatible with your exact playard model.
This applies even if a crib mattress appears to fit inside the playard. A mattress that fits dimensionally is not automatically a mattress that is safe or approved for that product.
Why Can’t You Use a Crib Mattress in a Pack ’n Play?
A Pack ’n Play is not simply a smaller version of a traditional crib.
A standard crib has rigid sides that help keep the mattress in a fixed position. A Pack ’n Play, on the other hand, has flexible mesh or fabric sides. The mattress and side structure are designed to work together to help prevent dangerous gaps and entrapment.
Even if the mattress appears to fit snugly from the start, the playard wall can bend or move outward when a baby rolls or presses against the edge. The baby may roll or slide off the mattress into the gap that forms between the mattress and the playard wall. Body parts such as the head, arm, or leg may also become trapped. Depending on the baby’s position, entrapment can cause injury or, in the worst case, create a suffocation hazard.
This is why “it fits” isn’t enough when you’re choosing a mattress for a Pack ’n Play.
Why a Regular Crib Mattress Doesn’t Work in a Pack ‘n Play: This chart shows how a solid wooden crib (on the left) keeps the mattress perfectly in place with no gaps. On the right, you can see how a baby’s weight pressing against the soft, mesh wall of a Pack ‘n Play causes the fabric to push outward, creating a dangerous trap zone (shown in red) where a baby could get stuck.
CPSC says aftermarket playard mattresses must meet compatibility requirements and clearly identify the playard models they are designed for. CPSC also warns consumers not to use an aftermarket mattress without confirming its specific compatibility with the product.
What About a Mini Crib Mattress?
A mini crib mattress should also not be added to a Pack ’n Play simply because its dimensions appear to be a close match.
A mini crib is a different type of sleep product. Like a full-size crib, it has rigid sides designed to hold the mattress in place. Mini crib mattresses are also generally thicker than the sleep surface designed for a Pack ’n Play.
If you’re considering a particular mini crib mattress, check whether the manufacturer specifically identifies it as compatible with your exact playard model. In practice, finding a mini crib mattress with that kind of specific compatibility can be difficult.
Newton is one brand parents frequently ask us about because of its popular crib mattresses and the company’s mini crib option. We’ve heard from many parents wondering whether a Newton mini crib mattress can be used in a Pack ’n Play.
While Newton makes excellent crib mattresses, its mini crib mattress is still designed for a mini crib, not a Pack ’n Play. Because we’ve received so many questions about this specific combination, we wrote a separate guide explaining whether you can use a Newton mattress in a Pack ’n Play and why the answer is no.
Can You Use a Newton Mattress in a Pack ’n Play?
Is the Pack ’n Play Mattress Too Firm?
This is one of the most common reasons parents start looking for another mattress.
Compared with a traditional crib mattress, the sleep surface that comes with a Pack ’n Play can feel surprisingly thin and firm. If you’re used to an adult mattress, it may not look particularly comfortable.
But infant sleep surfaces are intentionally firm.
A firm, flat sleep surface helps reduce the chance of a baby’s face sinking into the surface during sleep. If you’re wondering why infant mattresses are intentionally firm, see our guide to why babies need a firm crib mattress.
Can You Add a Mattress Topper or Extra Padding?
No.
Don’t add a mattress topper, cushion, pillow, folded blanket, or other soft material to the bottom of a Pack ’n Play to make it more comfortable. Extra padding can create a suffocation hazard and also change the fit and position of the sleep surface.
For the same reason, don’t try to solve a fit problem by placing another pad underneath a mattress or filling spaces around the edges with blankets or towels.
Don’t modify the sleep surface. Use the playard as the manufacturer intended.
What Mattress Should You Use in a Pack ’n Play?
For most Pack ’n Plays, the answer is simple: Use the mattress or pad that came with the playard.
If the original mattress is damaged or you need a replacement, don’t choose one based only on dimensions or a product title such as “Pack ’n Play mattress.” Instead, check the manufacturer’s instructions and look for a replacement that is specifically identified as compatible with your exact playard model.
CPSC advises parents to use an aftermarket mattress only when the manufacturer specifically identifies it as compatible with their Pack ’n Play model.
Before buying a replacement, check:
- The exact brand and model of your playard
- The manufacturer’s instructions
- Whether the replacement mattress is specifically identified as compatible with that model
- Whether the mattress comes with the required attachment or fastening system, if applicable
- Whether the product has current safety information and warnings
If you can’t confirm that a replacement mattress is specifically compatible with your playard, the safer choice is not to use it.
What About Pack ’n Play Mattresses Sold as “Universal”?
Be careful with the word “universal.”
A mattress may be advertised as fitting a standard playard size, but that doesn’t necessarily mean it has been verified for your particular model.
Measurements such as 38 × 26 inches shouldn’t be your only deciding factor. Two products can have similar interior dimensions while having different floor structures, attachment systems, side construction, or mattress requirements.
Similar dimensions do not automatically mean compatibility.
What If Your Pack ’n Play Mattress Looks Too Small?
A Pack ’n Play mattress can look surprisingly small compared with a traditional crib mattress. That’s not necessarily a problem.
The supplied sleep surface is designed for that particular playard. Don’t try to fill extra space with another mattress, padding, blankets, or towels.
If the supplied mattress doesn’t appear to fit correctly, check the manufacturer’s instructions and contact the manufacturer rather than modifying the sleep surface yourself.
What If You Already Bought a Crib Mattress for Your Pack ’n Play?
If you bought a crib mattress intending to use it in your Pack ’n Play, don’t try to make it work by modifying the setup.
Don’t:
- Add padding around the edges
- Put another pad underneath it
- Fill gaps with blankets or towels
- Fold or compress the mattress
- Raise the mattress with another material
- Use it simply because it appears to fit
It may be frustrating to have purchased the wrong mattress, but modifying a baby sleep product isn’t a good workaround for a compatibility problem.
The Bottom Line
You should not put a standard crib mattress in a Pack ’n Play.
A crib mattress is designed for a crib, while a Pack ’n Play is a flexible-sided baby bed with its own sleep-surface design.
For infant sleep, use the mattress or pad supplied with your Pack ’n Play. If you need a replacement, choose one specifically identified as compatible with your exact playard model rather than relying on measurements or generic “Pack ’n Play” sizing.
And don’t add extra mattresses, toppers, pillows, blankets, or cushions to make the sleep surface softer.
When it comes to a Pack ’n Play, the goal isn’t to make the mattress look or feel like a traditional crib mattress. The goal is to use the sleep surface the product was designed and tested to work with.