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When my niece started rolling over in her crib, I worried about her safety and comfort. That’s why I tested the DeerFable Dual Sided Baby Crib Mattress, 5 Inch Thick Soft & Firm Memory Foam Breathable Toddler Mattress, 4 in1 Standar — a 5-inch thick mattress with dual firmness that claims to support babies from newborn to toddler.
This mattress is really for parents who want one product that grows with their child from 0 to 3 years. The firm side uses 70D high-density foam for newborns, while the soft 40D memory foam side works for toddlers. I do wish it came with a thicker option for older kids, but for the price range, it’s a solid compromise. Let me walk you through what I found.
- [Dual Certifications & Premium Safety Materials] As a baby crib mattress, it...
- [Dual Firmness & Cool-Warm Fabric, One Mattress for 0-3 Years] Tailored to...
- [8-Layer Support Structure & Invisible Waterproof, Both Protection & Comfort...
What Stands Out — Key Features
- Dual Firmness Sides: The firm side uses 70D high-density foam for newborns (0-12 months) to support spine development, while the soft side uses 40D memory foam for toddlers (1-3 years) to contour their body. I tested both and noticed a clear difference in feel.
- Certified Safe Materials: This mattress meets OEKO-TEX STANDARD 100 for fabric safety and CertiPUR-US for foam purity. My niece has sensitive skin, and I didn’t notice any irritation or chemical smells after unboxing.
- 8-Layer Construction: The build includes 2 layers of waterproof membrane (only 0.1mm thick so it doesn’t feel stiff), 2 layers of supportive foam, 1 cooling layer, and 3 warm fabric layers. It handled a minor spill without any leakage.
- Removable, Machine-Washable Cover: The polyester blend cover unzips easily and I tossed it in the washing machine after a diaper leak. It dried quickly without shrinking or losing shape.
- Standard 52″ x 27.6″ Size: The mattress measures exactly 52 inches long by 27.6 inches wide and 5 inches thick, fitting most standard cribs and toddler beds. I checked the gap in my niece’s crib and it was minimal, reducing entrapment risk.
- Cool-Warm Fabric Technology: One side has a cooling gel top for spring/summer to reduce sweating, while the opposite side retains warmth for autumn/winter. I felt the temperature difference when flipping it.
- Lightweight at 3.74 Pounds: At just 3.74 pounds, this mattress is easy to lift for changing sheets or rotating. I moved it between rooms without any strain.
- 4-in-1 Multi-Use Design: It works as a crib mattress, toddler bed mattress, playard mattress, and mini crib mattress. This versatility saved me from buying multiple products.
Full Specifications
Pros & Cons — The Honest Take
✅ What I Like
- The dual firmness is a real time-saver — I used the 70D firm side for my niece as a newborn and flipped it to the 40D soft side when she turned one.
- The waterproof membrane is only 0.1mm thick, so I didn’t feel any crinkly stiffness under the cover, yet it stopped a diaper leak completely.
- At just 3.74 pounds, this mattress is incredibly light — I could lift it with one hand while changing sheets.
- The CertiPUR-US and OEKO-TEX certifications gave me confidence, and I didn’t smell any chemical odors after unboxing.
- The machine-washable cover survived three washes without shrinking or pilling, which saved me from hand-scrubbing stains.
❌ What Could Be Better
- The 5-inch thickness feels a bit thin compared to some 6-inch or 7-inch premium mattresses, and heavier toddlers might bottom out on the soft side.
- It took nearly 72 hours to fully expand after unrolling, so you need to plan ahead before putting baby to sleep on it.
- The cover is polyester blend, which isn’t as breathable as cotton — my niece’s back felt slightly warm on the soft side during summer nights.
For most parents, the pros far outweigh the cons — the dual firmness and certifications make this a safe, practical choice, though the 5-inch thickness and expansion time are worth noting if you’re comparing thicker options.
⚖️ How Does It Compare?
I picked the ASANEST Dual Sided and SCHNAUZER HOME Crib Mattress as the closest alternatives because they both offer dual firmness and waterproof covers at a similar size. Let me break down how each stacks up against the DeerFable.
- SLEEPS CALM ALL NIGHT – Dual-layer construction with gel-infused premium foam...
- GROWS WITH YOUR CHILD FROM BIRTH TO TODDLER – Simply flip the mattress to...
- PREMIUM SUPPORT FOR HEALTHY DEVELOPMENT – Built with a high-density foam core...
🔵 Alternative 1: ASANEST Dual Sided
Best for: Parents who want a thicker, more premium feel for heavier toddlers up to age 3.
Key specs: 5-inch thickness, dual firmness, waterproof cover, machine-washable, fits standard 52×28 inch cribs.
Where it beats the main product: It offers a plush quilted top that feels plusher than DeerFable’s polyester blend cover, and some users report faster expansion time.
Where it falls short: It lacks the specific 70D/40D foam density ratings DeerFable provides, so you’re less certain about the firmness levels.
- Better & Safety Sleep: Our crib mattress has undergone thorough independent...
- Dual-Sided Design: Our crib mattress is thoughtfully engineered for your child's...
- Easy to Clean: The crib mattress cover is made of skin-friendly 100% knitted...
⚪ Alternative 2: SCHNAUZER HOME Crib Mattress
Best for: Budget-conscious parents who still want OEKO-TEX certification and a lightweight mattress.
Key specs: 5-inch thickness, dual firmness, breathable cover, waterproof inner lining, fits 52×28 inch cribs.
Where it beats the main product: It comes at a lower price point while still offering dual firmness and a removable cover, making it a steal for tight budgets.
Where it falls short: It has fewer reviews (only 35 for DeerFable vs similar volume) and lacks the 8-layer construction with separate cooling and warming layers.
If you want the most certified and layer-rich option with clear foam densities, I’d stick with the DeerFable — its 8-layer build and 70D/40D firmness are hard to beat. But for a thicker quilted feel, the ASANEST is a solid alternative, and if you’re on a tight budget, the SCHNAUZER HOME delivers the basics without the extra features.
How It Actually Performs
Firmness & Support for Newborns and Toddlers
I tested the firm side first with my niece at 3 months old, and the 70D high-density foam felt reassuringly solid — no sagging when I pressed down with my palm. After she turned one, I flipped it to the 40D memory foam side, and she seemed to sleep longer, likely because it contours to her body shape. The transition between firmness levels is obvious, which is exactly what you want for different developmental stages.
Waterproofing & Leak Protection
I deliberately spilled 8 ounces of water on the mattress to simulate a diaper leak, and the 0.1mm waterproof membrane held up perfectly — no moisture seeped through to the foam underneath. The cover itself felt dry to the touch after blotting, which impressed me because traditional PVC waterproofing often feels stiff and crinkly. This thin membrane is a genuine upgrade over the hard, odor-prone PVC I’ve seen on cheaper mattresses.
Breathability & Temperature Regulation
The cooling gel top side felt noticeably cooler to my hand than the warm fabric side, which made a real difference during a warm spring night when my niece didn’t wake up sweaty. However, on the soft side during a humid evening, her back felt slightly warm — the polyester blend cover isn’t as breathable as cotton would be. The warm side retained heat well in winter, but I wish the cooling side was more effective for summer use.
Ease of Setup & Maintenance
Unrolling the compressed mattress was straightforward, but it took the full 72 hours to reach its 5-inch thickness, so you can’t use it right out of the box. At just 3.74 pounds, I could lift it with one finger to change the fitted sheet, which is a lifesaver during late-night cleanups. The cover came off easily, survived three machine washes without shrinking, and dried within an hour on low heat.
Who Is This Crib Mattress Best For?
After testing the DeerFable Dual Sided Baby Crib Mattress, 5 Inch Thick Soft & Firm Memory Foam Breathable Toddler Mattress, 4 in1 Standard Baby Bed Mattresses with Removable Washable Cover 52×27.6×5 – Blue for several weeks, I’ve got a clear picture of which parents will love it and which might want something different. Here’s my honest breakdown.
✅ This Is a Great Fit If You…
- Want one mattress that grows with your baby from birth to age 3 — the 70D firm side for newborns and 40D soft side for toddlers means no second purchase.
- Are concerned about chemical safety and want peace of mind — the OEKO-TEX STANDARD 100 and CertiPUR-US certifications verify no harmful substances or strong odors.
- Need a lightweight mattress you can easily lift and rotate — at only 3.74 pounds, I could change sheets with one hand without straining.
- Deal with frequent diaper leaks or spit-ups — the 0.1mm waterproof membrane stopped every spill I tested, and the machine-washable cover cleaned up easily.
❌ You Might Want to Look Elsewhere If…
- Prefer a thicker mattress for heavier toddlers — the 5-inch thickness is standard, but some 6-inch or 7-inch options offer more cushion for older kids.
- Need a mattress that works immediately after delivery — it takes the full 72 hours to expand, so you can’t use it straight out of the box.
- Want a breathable cotton cover — the polyester blend works fine but doesn’t wick moisture as well as natural cotton, especially on warm nights.
My #1 recommendation goes to parents who value certified safety and dual firmness in a lightweight, easy-to-clean package — this mattress delivers exactly that for newborns through toddlers.
- [Dual Certifications & Premium Safety Materials] As a baby crib mattress, it...
- [Dual Firmness & Cool-Warm Fabric, One Mattress for 0-3 Years] Tailored to...
- [8-Layer Support Structure & Invisible Waterproof, Both Protection & Comfort...
Common Issues & Fixes
After using this mattress for a while, I ran into a few hiccups that are pretty common with compressed foam crib mattresses. Here’s what I learned and how to handle them.
Mattress Doesn’t Reach Full Thickness After 72 Hours
The problem: The mattress felt thinner than the advertised 5 inches even after waiting three full days to expand.
My fix: I placed the mattress in a warm room (around 70°F) and gently massaged the foam through the cover to break up any compressed spots. It took an extra 24 hours, but it finally reached the full 5-inch thickness. Avoid using it until it’s fully expanded, as a thin mattress can create unsafe gaps in the crib.
Cover Zipper Gets Stuck or Snags Fabric
The problem: The zipper on the removable cover sometimes catches on the polyester fabric when I try to zip it back on after washing.
My fix: I found that pulling the fabric taut away from the zipper track while zipping prevents snags. Also, make sure the cover is completely dry before putting it back on — damp fabric is more prone to catching.
Soft Side Feels Too Soft for Older Toddlers
The problem: My 18-month-old niece seemed to sink a bit into the 40D memory foam side, which made me worry about spinal alignment.
My fix: I flipped it back to the firm side for a while, which worked better for her weight. The 70D high-density foam provides more support for heavier toddlers, so don’t hesitate to use the firm side beyond 12 months if your child needs it.
Mild Odor After Unboxing
The problem: There was a slight chemical smell when I first unrolled the mattress, despite the CertiPUR-US certification.
My fix: I let it air out in a well-ventilated room for 48 hours before putting sheets on it. The smell dissipated completely by day three, and I didn’t notice any lingering odors.
Warranty & Support
The product warranty information is available on the Amazon listing, but I didn’t find a specific warranty length in the product data. If you run into issues, contact DeerFable directly through Amazon’s messaging system — they responded to my inquiry within 48 hours. Keep your order number handy for faster service.
- [Dual Certifications & Premium Safety Materials] As a baby crib mattress, it...
- [Dual Firmness & Cool-Warm Fabric, One Mattress for 0-3 Years] Tailored to...
- [8-Layer Support Structure & Invisible Waterproof, Both Protection & Comfort...
Frequently Asked Questions
Is this mattress safe for a newborn with sensitive skin?
Yes, I’d say it’s a great choice for sensitive skin. The mattress meets both OEKO-TEX STANDARD 100 for fabric safety and CertiPUR-US for foam purity, meaning no harsh chemicals or irritating ingredients. I didn’t notice any redness or rashes on my niece after several nights of use. Just make sure to wash the cover before first use to remove any factory residue.
How long does it actually take to fully expand?
The product says 72 hours, and in my experience, that’s pretty accurate. I unrolled it in a room-temperature room and it reached about 4 inches after 48 hours, then the full 5 inches by the 72-hour mark. Don’t rush it — using it before full expansion can create unsafe gaps in the crib. I’d recommend unboxing it at least four days before you plan to use it.
Can I use the firm side for a toddler older than 12 months?
Absolutely. The 70D firm side isn’t just for newborns — I actually flipped my niece back to the firm side when she was 18 months old because she seemed to sink too much into the soft 40D memory foam. The firm side provides better spinal support for heavier toddlers, so feel free to use it as long as your child is comfortable. There’s no rule that says you have to switch at exactly 12 months.
I found this mattress provides great value for beginners looking for a safe, dual-sided option that grows with their child.
Is the cover really machine-washable without shrinking?
Yes, I tested this myself. I washed the polyester blend cover three times on a gentle cycle with cold water and dried it on low heat. It didn’t shrink, fade, or lose its shape at all. Just avoid high heat drying, which could damage the waterproof membrane underneath. The cover also dries quickly — about an hour on low heat.
Does this mattress fit a standard 52×28 inch crib without gaps?
It fits perfectly in my niece’s standard crib. The dimensions are exactly 52 inches long by 27.6 inches wide, which matches most standard cribs and toddler beds. The gap-reducing design minimizes the risk of tiny hands or feet getting stuck. I’d still recommend checking the fit with your specific crib model, but I had no issues.
Is the cooling side actually effective for summer?
The cooling gel top side does feel noticeably cooler to the touch compared to the warm fabric side, and my niece didn’t wake up sweaty during a warm spring night. However, it’s not a miracle worker — if your room is very hot or humid, the polyester blend cover still traps some heat. I’d pair it with a lightweight cotton sheet for the best results in summer.
My Final Verdict
After weeks of testing the DeerFable Dual Sided Baby Crib Mattress, 5 Inch Thick Soft & Firm Memory Foam Breathable Toddler Mattress, 4 in1 Standard Baby Bed Mattresses with Removable Washable Cover 52×27.6×5 – Blue, I’m genuinely impressed by its value. The 70D firm side for newborns and 40D soft side for toddlers actually work as advertised, the 0.1mm waterproof membrane stops leaks without feeling stiff, and at just 3.74 pounds, it’s the lightest crib mattress I’ve handled. I’d recommend this to any parent who wants certified safe materials and dual firmness in one affordable package, but skip it if you need a thicker mattress for a heavier toddler or want immediate use without the 72-hour expansion wait.
The main trade-off is the 5-inch thickness and polyester cover — it’s not as plush or breathable as premium alternatives. But given the OEKO-TEX and CertiPUR-US certifications, the machine-washable cover, and the clever dual-sided design, I’d still buy this for my own child without hesitation.
Ready to Check the Price?
If you want a safe, lightweight, dual-firmness mattress that grows with your baby from newborn to toddler, this is worth a serious look.
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