Simmons Kids SlumberTime Naturally 4-Inch Mini Crib Mattress
The Simmons Kids SlumberTime Naturally 4-Inch Mini Crib Mattress weighs 3.9 lb, is 4 in thick, and is 38 in long, per Simmons Kids. A 4-inch fiber mini crib mattress with a blended cotton cover and waterproof backing.
Made in the USA, per the maker “proudly made in Wisconsin with foreign and domestic parts” Source
- $69.99List price
- 4 inThickness
- 3.9 lbWeight
- FiberCore
How the SlumberTime Naturally 4-Inch Mini Crib Mattress stacks up
Against the 34 mini and portable crib mattresses we track. The shaded band is where the middle half of them fall; the dot is this one.
Within the typical range for mini and portable crib mattresses (37.5 in to 38 in).
The same as most mini and portable crib mattresses (24 in).
Within the typical range for mini and portable crib mattresses (2.8 lb to 8 lb).
Within the typical range for mini and portable crib mattresses (3 in to 4 in).
Within the typical range for mini and portable crib mattresses ($39.99 to $119).
What sets the SlumberTime Naturally 4-Inch Mini Crib Mattress apart
Measured against the 34 mini and portable crib mattresses we compare, from each maker's published specs.
- Weight: 3.9 lbin the middle half of the 29 mini and portable crib mattresses that publish it (2.8 lb to 8 lb)
Next to its closest matches
- Serta (Delta Children) SleepTrue 4 Inch MiniNext to it, the SlumberTime Naturally 4-Inch Mini Crib Mattress is $7 more.
- Sealy (made by Kolcraft) ED704Next to it, the SlumberTime Naturally 4-Inch Mini Crib Mattress is 0.3 lb heavier; 2 in thicker; $10 more.
- DaVinci Complete Slumber Waterproof Mini Crib MattressNext to it, the SlumberTime Naturally 4-Inch Mini Crib Mattress is 1 in longer; 0.1 lb lighter; 0.5 in thinner.
Fit check
| Size, per the maker | 38 × 24 × 4 in |
|---|---|
| Fits, per the maker | Maker says it fits most mini cribs and portable cribs; not designed for standard cribs or Pack 'n Plays; measure your crib first. |
Listed features
- Cover called breathable by maker
- Waterproof backing
- Light
Worth checking
- Priced above basic mini mattresses
- 1 year warranty only
Where to buy the SlumberTime Naturally 4-Inch Mini Crib Mattress
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- Check for recalls: Search the agency's recall list with the model number and date code from the label: CPSC recall search.
- Safe sleep: see the AAP's guide to safe sleep and NICHD Safe to Sleep. Check the label and the maker's instructions, and ask your pediatrician about your child.
Full specs
| Simmons Kids SlumberTime Naturally 4-Inch Mini Crib Mattress | |
|---|---|
| Type | Mini or portable crib mattress |
| List price | $69.99 |
| Size | 38 × 24 × 4 in |
| Thickness | 4 in |
| Made for | Maker says it fits most mini cribs and portable cribs; not designed for standard cribs or Pack 'n Plays; measure your crib first. |
| Weight | 3.9 lb |
| Core | Fiber: hypoallergenic fiber core made from recycled bottles (per the maker) |
| Waterproof | Yes |
| Breathable design | Yes, per the maker |
| Certifications | GREENGUARD Gold |
| Warranty | Limited 1 year |
| Made in | Wisconsin, USA |
Compare the SlumberTime Naturally 4-Inch Mini Crib Mattress with
How each closest rival differs from the SlumberTime Naturally 4-Inch Mini Crib Mattress, from the makers' specs.
- Serta (Delta Children)SleepTrue 4 Inch Mini3.9 lb4 in thick$62.99
- $7 less
- Sealy (made by Kolcraft)ED7043.6 lb2 in thick$59.99
- 0.3 lb lighter
- 2 in thinner
- $10 less
- DaVinciComplete Slumber Waterproof Mini Crib Mattress4 lb4.5 in thick$89
- 1 in shorter
- 0.1 lb heavier
- 0.5 in thicker
- Delta ChildrenTwinkle Stars 4-Inch Mini Crib Mattress3.9 lb4 in thick$49.99
- $20 less
SlumberTime Naturally 4-Inch Mini Crib Mattress: questions answered
From Simmons Kids's published specs, last checked 2026-11-02.
What does the Simmons Kids SlumberTime Naturally 4-Inch Mini Crib Mattress fit?
The maker lists it at 38 × 24 × 4 in. Per the maker: Maker says it fits most mini cribs and portable cribs; not designed for standard cribs or Pack 'n Plays; measure your crib first. Mini crib sizes vary by brand, so check your crib's manual for the exact mattress size it takes.
What is the Simmons Kids SlumberTime Naturally 4-Inch Mini Crib Mattress made of?
Hypoallergenic fiber core made from recycled bottles (per the maker). The maker lists GREENGUARD Gold. It weighs 3.9 lb, which matters when you change sheets.
Is the Simmons Kids SlumberTime Naturally 4-Inch Mini Crib Mattress waterproof or washable?
The maker says it has a waterproof surface or cover.
What's the difference between the Simmons Kids SlumberTime Naturally 4-Inch Mini Crib Mattress and the Serta SleepTrue 4-Inch Mini Crib Mattress?
By the maker specs, the SleepTrue 4 Inch Mini lists for $7.00 less. See them side by side.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.
More mini and portable crib mattresses
- Sealy (made by Kolcraft)ED7033.6 lb2 in thick$44.99
- SertaPerfect Embrace Mini Crib Mattress2.8 lb4 in thick$49.99
- KolcraftPediatric Mini Crib Mattress3.6 lb2 in thick$39.99
- Simmons KidsSoothing Nights 3" Mini/Portable Crib Hybrid Mattress3.9 lb3 in thick$34.99
- Dream On MeButterfly 3" Two-Sided Fiber Portable Mini Crib Mattress3 lb3 in thick$39
- Dream On MeSnuggles Breathable Extra Firm Fiber Portable Crib Mattress2.5 lb3 in thick$39.99
Where these specs come from
Last checked 2026-11-02. Spot something wrong? Tell us. Read our editorial and safety policy and corrections.