Serta SleepTrue 4-Inch Mini Crib Mattress
The Serta SleepTrue 4-Inch Mini Crib Mattress weighs 3.9 lb, is 4 in thick, and is 38 in long, per Serta (Delta Children). A 4 in fiber-core mattress with a waterproof vinyl cover for mini and portable cribs.
Made in the USA, per the maker “This baby mattress is proudly made in Wisconsin” Source
- $62.99List price
- 4 inThickness
- 3.9 lbWeight
- FiberCore
How the SleepTrue 4 Inch Mini 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 SleepTrue 4 Inch Mini 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
- Sealy (made by Kolcraft) ED704Next to it, the SleepTrue 4 Inch Mini is 0.3 lb heavier; 2 in thicker.
- Simmons Kids SlumberTime Naturally 4-Inch Mini Crib MattressNext to it, the SleepTrue 4 Inch Mini is $7 less.
- Delta Children Twinkle Stars 4-Inch Mini Crib MattressNext to it, the SleepTrue 4 Inch Mini is $13 more.
Fit check
| Size, per the maker | 38 × 24 × 4 in |
|---|---|
| Fits, per the maker | Most mini cribs and portable cribs; maker says NOT designed for standard cribs or Pack 'n Plays |
Listed features
- Waterproof vinyl cover
- Light at 3.9 lb
- Made in the USA
Worth checking
- Vinyl cover is wipe-clean only
Where to buy the SleepTrue 4 Inch Mini
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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
| Serta (Delta Children) SleepTrue 4 Inch Mini | |
|---|---|
| Type | Mini or portable crib mattress |
| List price | $62.99 |
| Size | 38 × 24 × 4 in |
| Thickness | 4 in |
| Made for | Most mini cribs and portable cribs; maker says NOT designed for standard cribs or Pack 'n Plays |
| Weight | 3.9 lb |
| Core | Fiber: hypoallergenic fiber core from recycled bottles (per the maker) |
| Waterproof | Yes |
| Washable cover | No |
| Certifications | GREENGUARD Gold |
| Warranty | 1 year limited |
| Made in | USA (Wisconsin) |
Compare the SleepTrue 4 Inch Mini with
How each closest rival differs from the SleepTrue 4 Inch Mini, from the makers' specs.
- Sealy (made by Kolcraft)ED7043.6 lb2 in thick$59.99
- 0.3 lb lighter
- 2 in thinner
- $3 less
- Simmons KidsSlumberTime Naturally 4-Inch Mini Crib Mattress3.9 lb4 in thick$69.99
- $7 more
- Delta ChildrenTwinkle Stars 4-Inch Mini Crib Mattress3.9 lb4 in thick$49.99
- $13 less
- Sealy (made by Kolcraft)ED7033.6 lb2 in thick$44.99
- 0.3 lb lighter
- 2 in thinner
- $18 less
SleepTrue 4 Inch Mini: questions answered
From Serta (Delta Children)'s published specs, last checked 2026-11-02.
What does the Serta SleepTrue 4-Inch Mini Crib Mattress fit?
The maker lists it at 38 × 24 × 4 in. Per the maker: Most mini cribs and portable cribs; maker says NOT designed for standard cribs or Pack 'n Plays. Mini crib sizes vary by brand, so check your crib's manual for the exact mattress size it takes.
What is the Serta SleepTrue 4-Inch Mini Crib Mattress made of?
Hypoallergenic fiber core from recycled bottles (per the maker). The maker lists GREENGUARD Gold. It weighs 3.9 lb, which matters when you change sheets.
Is the Serta SleepTrue 4-Inch Mini Crib Mattress waterproof or washable?
The maker says it has a waterproof surface or cover. The cover is not removable for washing.
What's the difference between the Serta SleepTrue 4-Inch Mini Crib Mattress and the Sealy Breathable Cotton Mini Crib Mattress?
By the maker specs, the ED704 lists for $3 less, the ED704 is lighter (3.6 vs 3.9 lb). 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
- SertaPerfect Embrace Mini Crib Mattress2.8 lb4 in thick$49.99
- KolcraftPediatric Mini Crib Mattress3.6 lb2 in thick$39.99
- DaVinciComplete Slumber Waterproof Mini Crib Mattress4 lb4.5 in thick$89
- 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.