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Smart Bottoms Smart One 4.0
One Size | 10–35 lbs | 100% Certified Organic Cotton
The Smart One 4.0 is a premium organic cotton all-in-one cloth diaper designed for simplicity, absorbency, and long-term durability. This one-size reusable diaper fits most babies from 10 to 35 pounds and provides reliable leak protection without unnecessary bulk.
With ten absorbent layers of certified organic cotton and an attached insert that folds for customized absorbency, the Smart One 4.0 delivers performance and convenience in one streamlined design.
Why Parents Choose the Smart One 4.0
100% Certified Organic Cotton Interior
The diaper is lined with certified organic cotton, providing a natural fiber layer against baby’s skin. No synthetic stay-dry materials are used inside the diaper.
Ten Layers of Absorbency
Built with ten super absorbent layers, this all-in-one diaper is designed to handle everyday wear while maintaining a trim fit.
Customizable Absorbency
The attached insert can be folded to concentrate absorbency exactly where your baby needs it most, making it suitable for both light and heavier wetters.
True All-in-One Convenience
Everything is sewn in. No stuffing, snapping, or assembling required. Diaper changes are quick and straightforward, making this an ideal option for caregivers, daycare, or cloth diaper beginners.
Faster Dry Time
The unique design allows for efficient washing and drying. Most machines will fully dry the diaper in one warm cycle.
Gentle, Leak-Reducing Fit
Wide, rolled leg elastic helps:
- Reduce red marks
- Improve comfort
- Prevent leaks
Materials
Inner: 100% Certified Organic Cotton
Outer: 100% TPU (waterproof and breathable)
Care Instructions
- Wash 1–2 times before first use to prep the fibers.
- Absorbency will continue to increase with regular washing and drying.
- Wash warm.
- Dry warm.
- Do not use bleach or fabric softener.
Smart Bottoms Smart One 4.0
One Size | 10–35 lbs | 100% Certified Organic Cotton
The Smart One 4.0 is a premium organic cotton all-in-one cloth diaper designed for simplicity, absorbency, and long-term durability. This one-size reusable diaper fits most babies from 10 to 35 pounds and provides reliable leak protection without unnecessary bulk.
With ten absorbent layers of certified organic cotton and an attached insert that folds for customized absorbency, the Smart One 4.0 delivers performance and convenience in one streamlined design.
Why Parents Choose the Smart One 4.0
100% Certified Organic Cotton Interior
The diaper is lined with certified organic cotton, providing a natural fiber layer against baby’s skin. No synthetic stay-dry materials are used inside the diaper.
Ten Layers of Absorbency
Built with ten super absorbent layers, this all-in-one diaper is designed to handle everyday wear while maintaining a trim fit.
Customizable Absorbency
The attached insert can be folded to concentrate absorbency exactly where your baby needs it most, making it suitable for both light and heavier wetters.
True All-in-One Convenience
Everything is sewn in. No stuffing, snapping, or assembling required. Diaper changes are quick and straightforward, making this an ideal option for caregivers, daycare, or cloth diaper beginners.
Faster Dry Time
The unique design allows for efficient washing and drying. Most machines will fully dry the diaper in one warm cycle.
Gentle, Leak-Reducing Fit
Wide, rolled leg elastic helps:
- Reduce red marks
- Improve comfort
- Prevent leaks
Materials
Inner: 100% Certified Organic Cotton
Outer: 100% TPU (waterproof and breathable)
Care Instructions
- Wash 1–2 times before first use to prep the fibers.
- Absorbency will continue to increase with regular washing and drying.
- Wash warm.
- Dry warm.
- Do not use bleach or fabric softener.
While our trainers do have a waterproof layer to help prevent puddles, they are not intended to replace a diaper. The Daytime Trainer will hold a small accident but if a toddler completely eliminates their bladder, or has more than one accident, it will likely leak. If your child is not showing signs of readiness continuing to use a diaper is recommended. If they are having frequent accidents or are new to potty training, we recommend starting out with our Nighttime Trainer, they will offer twice the absorbency to help catch bigger accidents.
The UPF 50+ Rash Guard in Make a Splash is a Smart Bottoms swim top rated UPF 50+ for water play. It suits pool-scheduled families who sunscreen once and swim long.
Make a Splash names the whole assignment. Per the listing these bumblito rash guards are UPF 50+ rated for peace of mind during water play, in a 40% polyester, 40% nylon, 20% spandex knit.
- UPF 50+ rated
- Make a Splash print
- 40% polyester / 40% nylon / 20% spandex per the listing
- Machine dry low with like fabrics
- Sizes 12-24 months through children's 5-6
What does UPF 50+ mean?
Strong built-in sun protection for water play, per the rating in the product name - peace of mind that does not wash off.
When does a rash guard earn its keep?
Long pool afternoons and beach days - it covers the skin sunscreen misses between reapplications.
How should I dry it?
Gently and away from rough fabrics or hook-and-loop closures, which can snag swimwear knits.
Splash on with the UPF 50+ Rash Guard in Dinomite.
The UPF 50+ Rash Guard in Dinomite is a Smart Bottoms swim top rated UPF 50+ for water play. It suits dino-roaring swimmers stomping through swim lessons.
Dinomite unleashes prehistoric energy on the pool deck. The UPF 50+ rating in its name does the quiet work while the print does the roaring.
- UPF 50+ rated
- Dinomite print
- Stretchy swim-knit build
- Dry away from rough fabrics and velcro
- Sizes 12-24 months through children's 5-6
When does a rash guard earn its keep?
Long pool afternoons and beach days - it covers the skin sunscreen misses between reapplications. It survives the diaper bag, the car seat, and the stroller basket in one afternoon.
How should I dry it?
Gently and away from rough fabrics or hook-and-loop closures, which can snag swimwear knits.
What pairs with it?
A reusable swim diaper below for the littlest swimmers - one kit, whole pool day. Hand-me-down prospects are strong - the style reads current for years at a stretch.
Splash on with the UPF 50+ Rash Guard in Water Me.
The UPF 50+ Rash Guard in Water Me is a Smart Bottoms swim top rated UPF 50+ for water play. It suits garden-pun households that bloom at the splash pad.
Water Me is the sprinkler-season pun made wearable - kids do grow when watered. Sun coverage per the UPF 50+ name, giggles included.
- UPF 50+ rated
- Water Me print
- Stretchy swim-knit build
- Dry away from rough fabrics and velcro
- Sizes 12-24 months through children's 5-6
How should I dry it?
Gently and away from rough fabrics or hook-and-loop closures, which can snag swimwear knits.
What pairs with it?
A reusable swim diaper below for the littlest swimmers - one kit, whole pool day.
What does UPF 50+ mean?
Strong built-in sun protection for water play, per the rating in the product name - peace of mind that does not wash off. Gift-givers favor it because the choice is nearly impossible to botch.
Splash on with the UPF 50+ Rash Guard in Chill Out.
Smart Bottoms Born Smart 2.0 Newborn Cloth Diaper - Dragon Dreams
- Longer rise and an additional row of rise snaps.
- No-prep, organic cotton/hemp interior.
- Sewn-in insert for ease of use and quick dry time.
- Extra row of tab snaps for better fit around tiny legs.
- Umbilical notch to keep belly button area clean and dry.
Material Contents Outer: 100% PUL, Inner: 55% Hemp Viscose, 45% Organic Cotton
Fits 6-16 pounds
Care Instructions Wash and Dry Warm. Do not use bleach or fabric softener.
Continue with this adorable cloth diaper print as baby grows up with the Smart Bottoms' Dream Diaper 2.0, Smart One 3.1 cloth diaper
The UPF 50+ Rash Guard in Chill Out is a Smart Bottoms swim top rated UPF 50+ for water play. It suits cool-customer swimmers who own the shallow end.
Chill Out sets the pool-day attitude right in the print name. The UPF 50+ rating keeps the vibe protected past the first hour.
- UPF 50+ rated
- Chill Out print
- Stretchy swim-knit build
- Dry away from rough fabrics and velcro
- Sizes 12-24 months through children's 5-6
What pairs with it?
A reusable swim diaper below for the littlest swimmers - one kit, whole pool day.
What does UPF 50+ mean?
Strong built-in sun protection for water play, per the rating in the product name - peace of mind that does not wash off.
When does a rash guard earn its keep?
Long pool afternoons and beach days - it covers the skin sunscreen misses between reapplications.
Splash on with the UPF 50+ Rash Guard in Make a Splash.
The Small Wet Bag in How We Roll is a Smart Bottoms reusable wet bag in the How We Roll print. It suits day-trip diaper bags with a sense of humor.
How We Roll wears its motto proudly - the errand-running print for families in constant motion. It makes the humble utility bag the funniest thing in the tote.
- Smart Bottoms Small Wet Bag
- How We Roll print
- Small tier of the wet bag range
- Keeps damp gear separated from dry
- Part of the Smart Bottoms accessories line
Which wet bag size fits my routine?
Mini for pocket-scale items, Small for quick trips, On-the-Go for full days out, Hanging for home base - pick by how far you roam.
Why keep more than one?
Rotation - one in the bag, one in the wash, and the day never catches you without.
How do prints matter on gear?
You reach for gear you like - a good print keeps the practical habit pleasant.
Build the fleet with the On-the-Go Wet Bag in Tea Party.
The On-the-Go Wet Bag in Tea Party is a Smart Bottoms reusable wet bag in the Tea Party print. It suits full-day outings dressed better than they need to be.
Tea Party lends the workhorse bag a porcelain-and-doilies charm. Practical cargo, formal invitation.
- Smart Bottoms On-the-Go Wet Bag
- Tea Party print
- On-the-Go tier of the wet bag range
- Keeps damp gear separated from dry
- Part of the Smart Bottoms accessories line
What goes in a wet bag?
Anything damp that should not meet anything dry - cloth diapers, swimsuits, bibs, and the occasional mystery sock.
Do wet bags work beyond diapering?
Famously - pool days, gym clothes, travel toiletries, and beach treasure all ride home in them.
Which wet bag size fits my routine?
Mini for pocket-scale items, Small for quick trips, On-the-Go for full days out, Hanging for home base - pick by how far you roam.
Build the fleet with the Small Wet Bag in Cherish.
While our trainers do have a waterproof layer to help prevent puddles, they are not intended to replace a diaper. The Daytime Trainer will hold a small accident but if a toddler completely eliminates their bladder, or has more than one accident, it will likely leak. If your child is not showing signs of readiness continuing to use a diaper is recommended. If they are having frequent accidents or are new to potty training, we recommend starting out with our Nighttime Trainer, they will offer twice the absorbency to help catch bigger accidents.
bumblito and Smart Bottoms -
Sunnyside
Smart Bottoms Born Smart 2.0 Newborn Cloth Diaper
- Longer rise and an additional row of rise snaps.
- No-prep, organic cotton/hemp interior.
- Sewn-in insert for ease of use and quick dry time.
- Extra row of tab snaps for better fit around tiny legs.
- Umbilical notch to keep belly button area clean and dry.
Material Contents Outer: 100% PUL, Inner: 55% Hemp, 45% Organic Cotton
Fits 6-16 pounds
Care Instructions Wash and Dry Warm. Do not use bleach or fabric softener.
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Smart Bottoms Organic Cloth Diapers
Shop Smart Bottoms cloth diapers at Everetts Place. Smart Bottoms creates GOTS-certified 100% organic cotton cloth diapers including their beloved Dream Diaper and 3.1 All-in-One. Trusted by cloth diapering families for their trim fit, outstanding absorbency, and chemical-free materials, Smart Bottoms is the brand for parents who want the cleanest cloth diapering option available.