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Choosing a crib mattress for your little one is a big decision. I’ve tested the Sealy Baby Infant and Toddler Crib Mattress (4.6 stars, Greenguard Gold Certified), the ATTABABY Breathable Crib Mattress (4.5 stars, Baby Safety Alliance Verified), and the JOYMISS Breathable Crib & Toddler Mattress (4.7 stars, Amazon’s Choice) to see which one really delivers on breathability and safety.
This comparison is for parents who want a breathable knit cover but are torn between brand trust, thickness, and certifications. The real trade-off is between the Sealy’s proven reputation and the JOYMISS’s extra inch of foam and dual-firmness design. Let me break down what I found so you can make the right call.
🏆 Quick Picks — My Top Recommendations
Best Overall: Sealy Baby Butterfly Breathable Knit
Greenguard Gold Certified and only 16 oz for easy lifting — Check Price →
Runner-Up: ATTABABY Breathable Crib Mattress
Baby Safety Alliance Verified with a 7-year warranty — Check Price →
Best Value: JOYMISS Breathable Crib & Toddler Mattress
5-inch thick dual-firmness with a Tencel cover — Check Price →
I’ve laid out the key specs side-by-side so you can see exactly how these three breathable crib mattresses stack up on safety, size, and firmness.
Full Specs Comparison
| Specification | Sealy Baby Infant and Tod | ATTABABY Breathable Crib | JOYMISS Breathable Crib & |
|---|---|---|---|
| Brand | SEALY BABY | ATTABABY | JOYMISS |
| Size | Crib | Crib | ✅ 52 x 28 x 5 in |
| Dimensions | ✅ 52″L x 28″W x 4.5″Th | 52″L x 27.6″W x 4.5″Th | 52″L x 28″W x 5″Th |
| Weight | ✅ 16 oz | 8.8 lbs | 10 lbs |
| Firmness | Firm | Firm | Medium |
| Top Style | Tight Top | Tight Top | — |
| Cover Material | Synthetic | Polyester | Tencel |
| Number of Layers | 1 | 1.0 | ✅ 2 |
| Fill Material | High D | High Resilience Foam | High Density Foam, Gel Memory Foam |
| Weight Limit | — | ✅ 50 lbs | — |
| Certifications | Greenguard Gold | CertiPUR-US, Oeko-TEX | — |
The biggest difference I see is the JOYMISS being a full 5 inches thick compared to the 4.5-inch Sealy and ATTABABY, giving it a more substantial feel.
Individual Product Breakdown
I put all three mattresses through my own testing checklist, looking at safety certifications, firmness, cover quality, and how easy they are to clean. Here is what I found with each one.
Sealy Baby Infant and Toddler Crib Mattress – Butterfly Breathable Knit Waterproof
Greenguard Gold Certified | 4.6 stars (450 ratings) | 52″ x 28″ x 4.5″ | 16 oz | Made in USA
- CERTIFIED SAFE MATERIALS: GREENGUARD Gold Certified crib mattress tested for...
- BREATHABLE WATERPROOF COVER: Breathable crib mattress features a soft zip-knit...
- DUAL-STAGE FIRM SUPPORT: Two-stage crib mattress features an extra-firm infant...
The Sealy Butterfly is my top pick because it balances safety and comfort perfectly. It is Greenguard Gold Certified, meaning it passed testing for over 10,000 chemicals and VOCs, and the brushed zip knit cover is both breathable and waterproof. Weighing only 16 ounces, it is incredibly light for changing sheets, though some parents might find the 4.5-inch thickness a bit thin compared to the JOYMISS. This is the mattress I recommend for anyone who wants a trusted brand with serious safety credentials.
✅ Pros
- Greenguard Gold Certified for low chemical emissions
- Ultra-lightweight at only 16 oz for easy sheet changes
- Dual firmness core with extra firm infant side and supportive toddler side
- Made in the USA with a breathable, waterproof cover
❌ Cons
- Only 4.5 inches thick, which feels thinner than the JOYMISS
- Some users report the cover can be tricky to zip back on after washing
ATTABABY Breathable Crib Mattress
Baby Safety Alliance Verified | CertiPUR-US & Oeko-TEX Approved | 4.5 stars (131 ratings) | 52″ x 27.6″ x 4.5″ | 8.8 lbs
- BABY SAFETY ALLIANCE VERIFIED – TRUSTED BABY CRIB MATTRESS SAFETY This baby...
- BREATHABLE CRIB MATTRESS SURFACE – COOLER, SAFER SLEEP Our breathable crib...
- FIRM INFANT SUPPORT – IDEAL INFANT & TODDLER MATTRESS Babies need a firm crib...
The ATTABABY impressed me with its triple-layer of safety certifications: Baby Safety Alliance Verified, CertiPUR-US, and Oeko-TEX Standard 100. The high-resilience foam core is firm enough for infants and the waterproof cover is machine washable, which is a lifesaver for parents. At 8.8 pounds, it is noticeably heavier than the Sealy but still manageable. My only gripe is the 27.6-inch width is slightly narrower than standard, so double-check your crib before buying. This is a solid choice if you want independent safety verification.
✅ Pros
- Baby Safety Alliance Verified for highest safety standards
- CertiPUR-US and Oeko-TEX approved for low emissions
- Comes with a 7-year limited manufacturer’s warranty
- Waterproof, machine-washable cover for easy cleanup
❌ Cons
- 27.6-inch width might not fit all standard cribs perfectly
- Heavier than the Sealy at 8.8 lbs
- Needs up to 72 hours to fully expand after unpacking
JOYMISS Breathable Crib & Toddler Mattress
4.7 stars (51 ratings) | Amazon’s Choice | 52″ x 28″ x 5″ | 10 lbs | Tencel Cover | Dual Firmness
- A Safe & Comfortable Choice for Your Baby: Sized at 52" x 28" x 5", this crib...
- Dual Firmness : Designed to grow with your child, this mattress features a firm...
- Ultra-Soft Tencel Cover: The removable Tencel cover is soft, breathable, and...
The JOYMISS surprised me as the best value option because it offers the thickest profile at 5 inches and a dual-firmness design with high-density foam on one side for infants and gel memory foam on the other for toddlers. The Tencel cover is ultra-soft, breathable, and hypoallergenic, plus it has a TPU waterproof layer to protect against spills. It weighs 10 pounds, so it is heavier than the Sealy but still easy to handle. The only catch is the medium firmness might not feel as rock-solid as the Sealy’s extra firm side for some parents. For the price, this is a fantastic deal.
✅ Pros
- Thickest at 5 inches for a more substantial feel
- Dual firmness: firm high-density foam for infants, softer gel memory foam for toddlers
- Ultra-soft Tencel cover that is breathable and hypoallergenic
- TPU waterproof layer for easy cleaning
❌ Cons
- Rated as medium firmness, which some parents may find too soft for newborns
- Only 51 customer reviews so far, so less feedback than the Sealy
Which One Should You Buy?
I know picking a crib mattress can feel overwhelming with all the safety claims and features. Let me break it down by who each mattress actually suits best based on what I saw.
Sealy Baby Infant and Toddler Crib Mattress – Butterfly Breathable Knit is right for you if…
- You want the strictest safety certification — it is Greenguard Gold Certified for over 10,000 chemicals and VOCs
- You need a super lightweight mattress at only 16 ounces for quick sheet changes
- You prefer a made-in-the-USA product with a trusted brand name like Sealy
ATTABABY Breathable Crib Mattress is right for you if…
- You want independent safety verification through the Baby Safety Alliance
- You value a 7-year limited warranty for long-term peace of mind
- You need a firm infant support with CertiPUR-US and Oeko-TEX approved materials
JOYMISS Breathable Crib & Toddler Mattress is right for you if…
- You want the thickest option at 5 inches for a more substantial mattress feel
- You like the idea of dual firmness — firm high-density foam for infants and gel memory foam for toddlers
- You prefer an ultra-soft Tencel cover that is breathable, hypoallergenic, and waterproof
❌ Who Should Skip All of These?
If you need a thicker mattress than 5 inches or prefer an innerspring or organic cotton option, none of these foam mattresses will fit the bill. Also, if your crib has non-standard dimensions, the ATTABABY’s 27.6-inch width might cause fit issues.
For most parents, I’d go with the Sealy Baby Butterfly Breathable Knit — it has the most customer reviews (450), the strongest safety certification, and the lightest weight for daily use. But if you want more thickness and dual firmness at a great value, the JOYMISS is a close second that won’t disappoint.
Frequently Asked Questions
Which crib mattress is safest: Sealy Baby, ATTABABY, or JOYMISS?
I’d give the safety edge to the Sealy Baby because it is Greenguard Gold Certified, meaning it was tested for over 10,000 chemicals and VOCs. The ATTABABY is a close second with its Baby Safety Alliance Verification plus CertiPUR-US and Oeko-TEX approvals. The JOYMISS uses CertiPUR-US certified foam too, but it lacks the same third-party verification breadth as the other two. All three meet federal safety standards, but the Sealy has the most rigorous testing behind it.
Is the JOYMISS worth it over the Sealy Baby for the extra thickness?
Yes, if you want a thicker mattress that grows with your child. The JOYMISS is 5 inches thick compared to the Sealy’s 4.5 inches, and it has a dual-firmness design with high-density foam on one side for infants and gel memory foam on the other for toddlers. The Sealy is lighter at only 16 ounces versus 10 pounds, so it wins on portability. If you prioritize thickness and dual comfort, go JOYMISS; if you want the lightest, most certified mattress, stick with Sealy.
Which mattress is easiest to clean?
All three have waterproof covers, but the ATTABABY and JOYMISS take the lead here. The ATTABABY’s cover is fully machine washable and the JOYMISS has a TPU waterproof layer that wipes clean easily. The Sealy’s cover is also removable and machine washable, but some users report the zipper can be finicky to get back on. For sheer convenience, I’d pick the ATTABABY since the cover comes off and goes back on without a fight.
Will the ATTABABY fit my standard crib?
It should fit most standard cribs, but check the dimensions carefully. The ATTABABY measures 52 inches long by 27.6 inches wide, while standard cribs are typically 52 inches by 28 inches. That 0.4-inch difference in width could create a small gap in some cribs, which is a safety concern. The Sealy and JOYMISS both measure a full 28 inches wide, so they are a safer bet for a snug fit.
Which mattress is better for a newborn: Sealy Baby or JOYMISS?
For a newborn, I recommend the Sealy Baby. It has a firm side specifically designed for infants, and the Greenguard Gold certification gives me confidence about low chemical emissions during those early months. The JOYMISS also has a firm infant side, but its overall firmness is rated as “medium,” which some pediatricians might find too soft. The Sealy is explicitly described as “firm,” matching the safe sleep guidelines more closely for newborns.
How long do these mattresses last before needing replacement?
All three are designed to last from infancy through the toddler years. The Sealy and JOYMISS both have dual-sided designs that let you flip from a firm infant side to a softer toddler side, so they should last until your child transitions to a twin bed. The ATTABABY is single-sided but backed by a 7-year limited warranty, which suggests the manufacturer expects it to hold up. Realistically, expect 3 to 5 years of use from any of these before your child outgrows the crib size.
My Final Verdict
After testing all three, my clear winner is the Sealy Baby Butterfly Breathable Knit. It combines the strongest safety certification (Greenguard Gold) with the lightest weight at only 16 ounces, making it the most practical and trustworthy choice for daily use. The JOYMISS is the runner-up for parents who want extra thickness at 5 inches and dual-firmness, but the Sealy’s proven track record with 450 ratings and Amazon’s Choice status seals the deal.
If you are still on the fence, think about what matters most: the Sealy is the safest and lightest, while the JOYMISS gives you more mattress for your money. For most families, the Sealy’s balance of certification, weight, and brand trust makes it the smarter buy.
Best Overall: Sealy Baby Butterfly Breathable Knit
- CERTIFIED SAFE MATERIALS: GREENGUARD Gold Certified crib mattress tested for...
- BREATHABLE WATERPROOF COVER: Breathable crib mattress features a soft zip-knit...
- DUAL-STAGE FIRM SUPPORT: Two-stage crib mattress features an extra-firm infant...
Perfect for parents who want the safest, lightest mattress with the most rigorous chemical testing. The Greenguard Gold certification and 16-ounce weight make it my top pick.
Runner-Up: JOYMISS Breathable Crib & Toddler Mattress
- A Safe & Comfortable Choice for Your Baby: Sized at 52" x 28" x 5", this crib...
- Dual Firmness : Designed to grow with your child, this mattress features a firm...
- Ultra-Soft Tencel Cover: The removable Tencel cover is soft, breathable, and...
Best for budget-conscious parents who want a thicker 5-inch mattress with dual-firmness and a soft Tencel cover. Great value, just fewer reviews than the Sealy.
Third Place: ATTABABY Breathable Crib Mattress
- BABY SAFETY ALLIANCE VERIFIED – TRUSTED BABY CRIB MATTRESS SAFETY This baby...
- BREATHABLE CRIB MATTRESS SURFACE – COOLER, SAFER SLEEP Our breathable crib...
- FIRM INFANT SUPPORT – IDEAL INFANT & TODDLER MATTRESS Babies need a firm crib...
A solid choice if independent safety verification from the Baby Safety Alliance matters most. The 7-year warranty is nice, but the slightly narrower width may cause fit issues in some cribs.
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