By Audrey HayesUpdated November 2026
Shopping for a simmons naturally safer organic crib mattress can feel like a maze of certification logos, foam types and marketing terms that don’t always mean the same thing. This guide compares five Simmons-line options for families who want a firm, breathable and low-chemical sleep surface for a baby. We judged each one on the certifications it carries (GREENGUARD Gold, CertiPUR-US, GOTS), what its core is made from, whether it is waterproof, how well it fits a standard crib, and how it suits different budgets and sleep needs. Everything here is based on manufacturer specifications and common owner feedback patterns, not on any testing we carried out ourselves.
Our top picks at a glance
- 1
TOP CHOICEBest overallSimmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy FoaView on Amazon - 2
TOP CHOICEBest for certified organic materialsDelta Children CleanEarth Certified Organic Crib and Toddler MattressView on Amazon - 3
TOP CHOICEBest for a lightweight, low-profile coreNaturepedic Organic Baby Crib Mattress – 2-Stage Lightweight Infant &View on Amazon - 4
Best budget pickSEALY BABY Naturalis Breathable Hybrid 2 Stage Waterproof Crib MattresView on Amazon - 5
Best for flipping between seasonsSimmons Kids Quiet Nights Dual Sided Baby Crib Mattress & Toddler MattView on Amazon
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Simmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy Foam Baby Crib Mattress | Overall balance of safety certifications and comfort | Plant-based soy foam core with GREENGUARD Gold and CertiPUR-US certification |
| Delta Children CleanEarth Certified Organic Crib and Toddler Mattress | Families prioritizing organic-certified materials | GOTS-certified organic construction |
| Naturepedic Organic Baby Crib Mattress | Lightweight handling and a two-stage firmness design | Two-stage core with a 52″ x 28″ standard crib size |
| Sealy Baby Naturalis Breathable Hybrid 2 Stage Waterproof Crib Mattress | Shoppers who want a lower-cost organic-style option | Breathable hybrid build with a waterproof cover |
| Simmons Kids Quiet Nights Dual Sided Baby Crib Mattress | Families who want one mattress that works across two firmness sides | Dual-sided design with a sustainably sourced core |
Simmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy Foam Baby Crib Mattress & Toddler Mattress – Waterproof – GREENGUARD Gold & CertiPUR-US Certified – Ideal Firmness – Made in USA
Simmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy Foam Baby Crib Mattress & Toddler Mattress – Waterproof – GREENGUARD Gold & CertiPUR-US Certified – Ideal Firmness – Made in USA
Best for: Overall balance of safety certifications and comfort
This is a strong starting point for parents who want plant-based foam, third-party chemical certifications and a mattress that also works when the child moves to a toddler bed.
Key specs:
- Two-stage design for infant and toddler use
- Plant-based soy foam core
- Waterproof cover
- GREENGUARD Gold and CertiPUR-US certified (per the listing name)
- Made in USA (per the listing name)
Pros:
- Carries two recognized low-emission and foam-content certifications
- Two-stage design extends its useful life
- Waterproof surface simplifies cleanup
Cons:
- Not certified organic in the GOTS sense, so it may not satisfy shoppers looking for organic fiber content
- Firmness suits most infants but parents who prefer a softer feel may want to compare
Bottom line: A sensible pick for families who want certified low-emission materials and a dependable, firm sleep surface without going fully organic.
Delta Children CleanEarth Certified Organic Crib and Toddler Mattress – GOTS Certified, Non-Toxic Breathable Baby Mattress – Regulates Temperature, 10-Year Warranty
Delta Children CleanEarth Certified Organic Crib and Toddler Mattress – GOTS Certified, Non-Toxic Breathable Baby Mattress – Regulates Temperature, 10-Year Warranty
Best for: Families prioritizing organic-certified materials
Suited to parents who read labels closely and want the GOTS (Global Organic Textile Standard) mark, which covers organic fiber content and processing, alongside a breathable construction.
Key specs:
- GOTS certified organic construction (per the listing name)
- Breathable core designed to regulate temperature (per the listing name)
- Crib and toddler mattress use (per the listing name)
- 10-year warranty (per the listing name)
Pros:
- GOTS certification is a recognized organic textile standard
- Long stated warranty period
- Breathable design is aimed at reducing heat buildup
Cons:
- Organic claims apply to specific materials; read the certification scope on the packaging
- Owners who want a softer surface may find it firm
Bottom line: Best for shoppers who want an organic-certified mattress with a long warranty and clear textile-standard backing.
Naturepedic Organic Baby Crib Mattress – 2-Stage Lightweight Infant & Toddler Mattress – Waterproof Bed Mattress for Crib – Non-Toxic for Baby and Toddler Bed – 52″ x 28″
Naturepedic Organic Baby Crib Mattress – 2-Stage Lightweight Infant & Toddler Mattress – Waterproof Bed Mattress for Crib – Non-Toxic for Baby and Toddler Bed – 52" x 28”
Best for: Lightweight handling and a two-stage firmness design
Useful for parents who change sheets often or move the mattress frequently, and for families who want a clearly sized standard crib mattress.
Key specs:
- Dimensions: 52″ x 28″ (per the listing name)
- Two-stage infant and toddler design
- Waterproof surface
- Marketed as non-toxic for baby and toddler bed use
Pros:
- Standard 52″ x 28″ size fits most full-size cribs
- Lightweight relative to many innerspring models
- Two stages support use beyond the infant months
Cons:
- Lightweight construction can feel less substantial to some buyers
- Verify the certification details on the current listing before purchase
Bottom line: A practical choice for busy households and frequent sheet changes, provided the standard crib size matches your frame.
SEALY BABY Naturalis Breathable Hybrid 2 Stage Waterproof Crib Mattress Plus Toddler Bed Fit, Natural Cotton, Non Toxic, GREENGUARD Gold Certified, Safety & Quality Tested, Made in USA, 52″X28″
SEALY BABY Naturalis Breathable Hybrid 2 Stage Waterproof Crib Mattress Plus Toddler Bed Fit, Natural Cotton, Non Toxic, GREENGUARD Gold Certified, Safety & Quality Tested, Made in USA, 52"X28"
Best for: Shoppers who want a lower-cost organic-style option
A reasonable fit for families who want natural cotton, a GREENGUARD Gold mark and a hybrid build without moving into premium pricing tiers.
Key specs:
- Hybrid two-stage construction (per the listing name)
- Natural cotton cover (per the listing name)
- GREENGUARD Gold certified (per the listing name)
- 52″ x 28″ standard crib size (per the listing name)
- Waterproof (per the listing name)
Pros:
- Budget-conscious option with recognized low-emission certification
- Breathable hybrid build aims to reduce overheating
- Toddler bed fit extends its use
Cons:
- Hybrid construction contains components beyond the cotton cover, so it is not fully organic
- Some owners prefer a firmer feel than hybrids typically provide
Bottom line: Good for families who want the most value among these five while still getting a recognized low-emission certification.
Simmons Kids Quiet Nights Dual Sided Baby Crib Mattress & Toddler Mattress – Sustainably Sourced Core – Waterproof – Hypoallergenic – GREENGUARD Gold Certified (Natural) – Ideal Firmness – Made in USA
Simmons Kids Quiet Nights Dual Sided Baby Crib Mattress & Toddler Mattress – Sustainably Sourced Core – Waterproof – Hypoallergenic – GREENGUARD Gold Certified (Natural) – Ideal Firmness – Made in USA
Best for: Families who want one mattress that works across two firmness sides
Helpful for parents who want flexibility, such as a firmer side for infancy and another side for later use, along with a hypoallergenic surface.
Key specs:
- Dual-sided design (per the listing name)
- Sustainably sourced core (per the listing name)
- Waterproof and hypoallergenic (per the listing name)
- GREENGUARD Gold certified, natural (per the listing name)
- Made in USA (per the listing name)
Pros:
- Two sides offer a firmness choice as the child grows
- Sustainably sourced core is stated in the listing
- Hypoallergenic and waterproof features suit everyday use
Cons:
- Dual-sided construction can be heavier to flip and turn
- Sustainability claims refer to sourcing, not organic certification
Bottom line: A solid choice for parents who value flexibility and a sustainable-sourcing story alongside low-emission certification.
Buying Guide
Certifications: What GREENGUARD Gold, CertiPUR-US and GOTS Actually Mean
Certifications are the fastest way to compare claims. GREENGUARD Gold is a low chemical emissions standard for indoor products. CertiPUR-US covers foam content, including limits on certain flame retardants, heavy metals and ozone-depleting substances. GOTS covers organic fiber content and processing from harvest through manufacturing. Each addresses a different question, so a mattress can carry one and not the others.
Good picks for this: Simmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy Foam Baby Crib Mattress, Delta Children CleanEarth Certified Organic Crib and Toddler Mattress
Core Material: Foam, Latex, Cotton and Hybrids
Core materials drive feel, breathability and weight. Plant-based or certified foams are common in this category, while hybrids combine foam with other components. Check what the core is made from and whether the listing names the material, since vague terms like “natural” do not specify content.
Good picks for this: Sealy Baby Naturalis Breathable Hybrid 2 Stage Waterproof Crib Mattress, Naturepedic Organic Baby Crib Mattress
Size and Fit for Your Crib
The most common standard crib mattress size in the US is 52″ x 28″. Measure your crib’s interior length and width, then add the thickness of the mattress edges. A mattress that is too small leaves gaps where a baby could become trapped, so the fit must be snug with no more than two fingers’ width of space between the mattress and the frame.
Good picks for this: Naturepedic Organic Baby Crib Mattress, Sealy Baby Naturalis Breathable Hybrid 2 Stage Waterproof Crib Mattress
Firmness and Infant Sleep Safety
Firm, flat surfaces are the standard recommendation for infant sleep. Soft bedding, pillows and bumpers should stay out of the crib. The mattress itself should feel firm when you press on it, with no sinking under a flat hand.
Good picks for this: Simmons Kids Quiet Nights Dual Sided Baby Crib Mattress, Simmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy Foam Baby Crib Mattress
Waterproofing and Cleanup
A waterproof cover protects the core from spit-up, diaper leaks and accidents. Look for a cover that wipes clean and check whether it can be machine washed or spot cleaned. Avoid covers that trap moisture against the core, as this can encourage mildew.
Good picks for this: Naturepedic Organic Baby Crib Mattress, Simmons Kids Quiet Nights Dual Sided Baby Crib Mattress
Durability and Long-Term Use
A mattress used from infancy into toddlerhood should hold its shape. Two-stage and dual-sided designs can extend use. Warranty length offers a rough signal of expected durability, so compare the stated coverage period on each listing.
Good picks for this: Delta Children CleanEarth Certified Organic Crib and Toddler Mattress, Simmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy Foam Baby Crib Mattress
Care and Maintenance
Rotate the mattress every few months if the manufacturer recommends it, and air it out regularly. Use a fitted crib sheet made for the mattress size, and avoid mixing in non-approved padding. For safety-related questions, consult your pediatrician or the manufacturer’s instructions.
Good picks for this: Sealy Baby Naturalis Breathable Hybrid 2 Stage Waterproof Crib Mattress, Naturepedic Organic Baby Crib Mattress
FAQ
What does “naturally safer” mean on a Simmons crib mattress?
The phrase is marketing language. Check the specific certifications on the listing, such as GREENGUARD Gold or CertiPUR-US, because those have defined criteria you can look up.
Is a GREENGUARD Gold mattress the same as an organic mattress?
No. GREENGUARD Gold addresses chemical emissions from finished products. Organic certifications like GOTS address the origin and processing of fibers. A mattress can carry one, both or neither.
What size crib mattress do I need?
Most standard US cribs use a 52″ x 28″ mattress. Measure your crib before ordering, because some frames are sized differently.
Is a firm mattress safer for babies?
Firm, flat surfaces are the standard guidance for infant sleep. The mattress should not sink when pressed. Consult your pediatrician for guidance specific to your baby.
Can I use these mattresses in a toddler bed?
Several listings in this comparison describe toddler use or two-stage designs. Check the manufacturer’s instructions for the appropriate age and setup.
Do waterproof covers affect breathability?
Some waterproof covers reduce airflow more than others. Breathable hybrid and organic constructions are designed to limit this effect, but airflow varies by model.
Should I buy a new mattress for every baby?
Many families reuse mattresses, but check the manufacturer’s guidance on wear, cleaning and age limits before passing one on.
Conclusion
For most families, the Simmons Kids SlumberTime Naturally 2-Stage Premium Plant-Based Soy Foam Baby Crib Mattress offers the most balanced mix of certifications, waterproofing and two-stage use. If certified organic materials matter most, the Delta Children CleanEarth Certified Organic Crib and Toddler Mattress is the closest match. The Naturepedic Organic Baby Crib Mattress suits households that prioritize lightweight handling, while the Sealy Baby Naturalis Breathable Hybrid 2 Stage Waterproof Crib Mattress is a sensible value option. The Simmons Kids Quiet Nights Dual Sided Baby Crib Mattress fits families who want firmness flexibility across two sides. Confirm the current certifications and dimensions on each listing before you buy.
Sources
- Federal safety guidance for infant sleep products and crib standards (cpsc.gov)
- Safe sleep recommendations for infants from the American Academy of Pediatrics (aap.org)
- Background research on indoor air emissions and household product exposure (nih.gov)
Related reading
- Savvy Baby Organic Crib Mattress: 5 Best Options for Safe Sleep (2026)
- Organic Quilted Crib Mattress Pad: How to Choose a Safe, Non-Toxic One (2026)
- Organic Naturepedic Crib Mattress: A Buyer's Guide to Safe Sleep (2026)
About Audrey Hayes
Audrey Hayes is part of our editorial team and reviews and edits our natural & eco parenting guides, checking product details against manufacturer specifications and owner feedback.
