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The no-assembly cloth diaper. Everything on the Smart One 4.0 is sewn in – ten layers of certified organic cotton and an attached insert you fold to put absorbency where your baby needs it – so changes are as quick as a disposable. Shown here in Hazel.
One size adjusts to fit most babies from 10 to 35 pounds, the wide rolled leg elastic sits gently on the skin and helps contain leaks, and the open design dries in a single warm cycle in most machines. A good pick for daycare, grandparents and cloth-diaper beginners.
Why parents choose it
- True all-in-one: nothing to stuff, snap or assemble
- 100% certified organic cotton interior (per Smart Bottoms) – no synthetic stay-dry layer
- Ten absorbent layers with a trim fit
- Attached insert folds to customize absorbency
- One size: fits approx. 10–35 lbs
- Wide, rolled leg elastic for comfort and leak containment
- Dries in one warm cycle in most machines
What's in the box
1 Smart One 4.0 all-in-one cloth diaper.
Size & specs
- Size: one size, approx. 10–35 lbs
- Inner: 100% certified organic cotton
- Outer: 100% TPU (waterproof, breathable)
Materials & care
Wash 1–2 times before first use; absorbency increases over the first washes. Wash warm, dry warm. No bleach or fabric softener.
Frequently asked questions
What is an all-in-one cloth diaper?
A diaper with the absorbent layers sewn into the waterproof shell. There is nothing to stuff or snap before a change, which is why all-in-ones are popular with daycares and new cloth-diaper families.
What weight range does one size cover?
Smart Bottoms rates the Smart One 4.0 for roughly 10 to 35 pounds; the rise snaps adjust the fit as your baby grows.
Can I add extra absorbency for overnight?
The attached insert folds to concentrate absorbency, but there is no pocket. For heavy overnight use, lay a separate doubler on top or consider the Dream Diaper 3.0 pocket diaper.
How long does it take to dry?
Smart Bottoms reports that most dryers finish it in one warm cycle thanks to the open insert design.
