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30 Day Money Back Guarantee on on select cloth diaper products. Free Shipping on thousands of cloth diaper products.
bumGenius 4.0 One-Size Stay-Dry Cloth Diaper 12-Pack
Our Price
Sale: $204.95
Save: $10.45

All orders ship FREE with Economy Shipping

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Product Description

Save when buying in bulk! Available in 6 packs12 packs and 24 packs.

Best selling, top-rated, and recognized for its quality and performance. bumGenius 4.0 is a one-size, pocket-style diaper
that will keep your baby dry and comfortable. 
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper
bumGenius 4.0 One-Size Cloth Diaper - Butternut
Look for our unique butterfly closure system to ensure you are getting Cotton Babies brand cloth Diapers

bumGenius 4.0 One-Size Cloth Diaper


  • Durable snap closures help keep diapers on older babies.
  • Generous sizing accommodates larger babies.
  • Easily replaceable elastic keeps your diapers fresh.
  • 3x3 snap down design adjusts the sizing to fit small, medium and large sizes (approximately 7-35+ pounds).
  • Trim, snug and comfortable stretchy tabs provide a custom fit.
  • Waterproof insert stopper prevents leaking at the tummy.
  • Diapers are bundled with two inserts: a newborn insert for newborns and a one-size insert for your older baby.
  • Wide slot opening makes it easy to stuff and remove insert.
  • Slot cover protects your baby from wetness.

All bumGenius One-Size Cloth Diapers include a small, lightweight insert for newborns and a larger one-size insert for your growing baby. When your baby outgrows the newborn insert, it works as an overnight booster or as extra absorbency for heavy wetters.

bumGenius 4.0 Snap Closure bumGenius 4.0 Hook & Loop Closure
bumGenius 4.0 Snap Closure - One-Size bumGenius 4.0 Hook % Loop Closure - One-Size

Cloth diapering has never been so easy!

bumGenius One-Size Cloth Diapers feature our trademarked butterfly closure system to provide a comfortable, trim fit. This simple design makes cloth diapering as easy as using disposables. The familiar design makes bumGenius one-size cloth diapers perfect for care providers who might be resistant to cloth diapering (including daycares).

Less Clutter

bumGenius One-Size Cloth Diapers fit most babies from 7 to 35+ pounds. No more sorting by size or having to carry multiple diapers when going out. Three snap-downs on the front of the diaper allow you to easily adjust the size of the diaper as your baby grows. For newborns, fold down the insert stopper for an extra-small rise.

Only the Best for Your Baby

The soft, waterproof outer fabric keeps the diaper trim on your newborn and toddler. Soft, sueded inner fabric gently wicks moisture away from your baby's skin. Super stretchy, gentle leg and back elastic with rolled out casings keeps the yuk in and help to keep red marks away. Our unique covered slot opening keeps your baby protected from moisture.

A Video Worth a Thousand Words

bumGenius demo movie What better way to see why everyone (even dad!) loves bumGenius! You will need Windows Media player to view the video. Click the size you would like to watch: small or large (Windows Media Player required).
(The yellow undies are just to cover the baby bits in the video. They are not part of the diaper.)

Product Warranty

bumGenius, Flip and Econobum products carry the best warranty in the industry. Read more about the warranty details.

Feel confident in your purchase!

The Cotton Babies Satisfaction Guarantee gives you 30 days to evaluate your purchase of most bumGenius, Flip or Econobum products. Read more about the satisfaction guarantee.

U.S. Patent No. 7,629,501; 8,062,276; 8,518,007. Other U.S. and International patents pending.
Designed by a mom.
Covers are manufactured in the USA.
Microfiber inserts are made in China.
bumGenius, Flip & Econobum are brands created by Cotton Babies, Inc.
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Product Reviews
Write a review of this product!
Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Nancy on Wednesday 02 January, 2013
Cotton Babies Verified Purchase

These are amazing diapers. I was trying to use the G Diapers for about 2 months and no matter what I tried they leaked. Nappy brand was ok but still not the right fit. Fuzzy buns didn't make the cut either. A friend of mine gave me a couple of bum genius 4.0 and I LOVE THEM. I didn't want to spend the money but I found my self washing the bumgenius every day to use them. (I only needed to wash my G's every 2 1/2 days) So I ended up buying 24! My son is super skinny and even the disposables leaked but not the 4.0! I started using my 2 diapers when is was about 9 lbs and very skinny legs not a leak yet and their probably should have been a couple since he can be a heavy wetter. I love these I only wish I would have known about them for my 2 older children. I could have saved a fortune!

Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Molly on Tuesday 27 November, 2012
Cotton Babies Verified Purchase

I used disposable diapers on my first son and for a year on my second son. Then I found out I was pregnant with my third child and we decided to make the switch to cloth. We started out cloth diapering my second son when he was a year. My daughter was born when he was 20 months and we've cloth diapered her the whole time. After a solid year and a half of cloth diapering (we have 36 4.0s total), I would say this...the 4.0s are such a fantastic product! I have had very few problems with them...the only ones being minor leaking and occasional diaper rash. Both of those problems were more of an "operator error" than an issue with the diaper...for the leaking, I just needed to add an extra insert at night. For the rash, I just needed to be a little more hands-on with the rinsing process when my kids were having "newborn poops." (Watch out for build-up around the elastic!) I have no issues with these diapers and I would recommend them to anyone. HUGE money savings and I actually hate using disposables now on the rare occasion that I use them circumstantially. Follow the washing instructions--with your own modifications after trial and error--and you won't regret the decision. Oh, and I recommend getting the snaps. The first 12 diapers I purchased were hook-and-loop and they wore out so quickly. I just converted them to snaps and now they're perfect!

Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Melissa on Tuesday 29 November, 2011

I LOVE these diapers. My son gets diaper rash from disposables, but not from bumGenius diapers. However, after 10 months my bumGenius diapers were no longer waterproof. I hadn't followed the directions and used bleach too frequently (maybe once a week, instead of once a month). I also put the diaper covers in the dryer and have since learnt that they should only be hung to dry. I returned the diapers to CottonBabies along with the receipt. Within two weeks they mailed me new diapers along with directions. CottonBabies sent emails keeping me up-to-date on the return processing and handled the entire exchange amazingly. I am so glad to have new diapers again and will do my best to wash them according to the directions this time!

Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Tiffany on Wednesday 16 November, 2011
Cotton Babies Verified Purchase

These are the best diapers!!!! i have used many brands but none that keep my babies bum dry like these. I got these in the mail and washed them and dried them and immediately started using them. I have used fuzzibunz for 8 months and decided to switch after getting a couple of used bumgenius on ebay. These are by far more superior than fuzzibunz they also do not leave red marks on my babies back!!! If your any mom like me i do not like to leave marks on my poor baby. These have not leaked at all yet. Fuzzibunz leaked all the time. I do not no if i was using them wrong or what. But to me if I am going to cloth diaper it should be simple and to the point. Fuzzibunz were neither. Even when i would let the back elastic out it still left red marks it just gapped more in the front

Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Maria on Sunday 22 May, 2011
Cotton Babies Verified Purchase

I absolutely adore these diapers. I live in Michigan where very few people seem to use cloth so everyone told me that I'd hate them, it'd be gross, and that it would wind up a waste of money. After the third week, I waited until my DS's umbilical cord fell off, we started with 24 of the 4.0s. For the first month and a half it was washing diapers every 36 or so hours but now at nearly four months it's down to every 3 or 4 days! He was getting rashes with the disposables and horrible blowouts and leaking. Now we do still get some leaks but my son pees more than I do it seems like and it's really not very often. Never a blow out. I use Charlie's soap powder and it seems to work really well, I don't think I've lost any absorbency though I'm not 100 percent on if it's an "OK" detergent for these diapers. I use a washable liner with washable BumGenius wipes, a great method and makes diapering very affordable after the initial investment. Oh, and best of all: My husband uses them and even thanked me for buying them and saving us the money. At first he thought I was insane.

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