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bumGenius 4.0 One-Size Stay-Dry Cloth Diaper

by bumGenius

bumGenius 4.0 One-Size Stay-Dry Cloth Diaper
Our Price $17.95
Sale: $12.95
Save: $5.00

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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. Pat. 7,629,501; 8,777,915; 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.
Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Elsa on Friday 02 October, 2015

I love BumGenius 4.0 pocket diapers! I used fuzzibunz with my 1st and I absolutely despised them. Poor quality, leaked, and were not good quality. I was so frustrated that I finally gave up. Now, with my 2nd (5months old now) I decided to try BumGenius and I'm so glad I did. Great price! Great quality! Amazing product all around! I have had ZERO issues with these! Never had leaking issues or smells or anything. They are super easy to use and easy to wash. I would highly recommend BumGenius! And Cotton Babies is amazing too. Easy ordering and fast shipping. I ordered the snaps. BumGenius is golden. Will never go back to fuzzibunz or any other brand. :)

Rating: 3 of 5 Stars! [3 of 5 Stars!]
Reviewed by Kerry on Thursday 03 September, 2015
Cotton Babies Verified Purchase

I would say that I'm overall satisfied with my 12-pack of diapers, they do the job and are the trimmest ones I've seen. However, if you're looking for a diaper to last through more than one child or a high quality diaper, this isn't it. My biggest problem is the "stay dry" micro-fleece liner and the flap to stuff the diapers in. The liner is a very flimsy fleece that doesn't wick moisture away very well. I've also had issues with the material just not getting clean compared to my other diapers (even after following instructions). The flap, on the other hand, needs to be pulled down well or else leaking around the waistband can occur too. In the future, I'd like to see BumGenius use better materials, especially considering that people pay a fair amount of their hard earned money to buy them!

Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Amanda on Monday 31 August, 2015

I love these diapers! I ruined my first stash bc I washed them on a sanitize cycle regularly which makes the water hotter than normal and it definitely cut the life if my elastic and pul. But that's to be expected. I purchased some charlie bananas as well and notices that just by washing in hot water the pul is sticky and they get moist, not leak just feel moist when baby is wet. I actually purchased 6 4.0's from the seconds sale and so far I absolutely love them! I don't wash any ofy covers in hot water anymore though, just warm. I'm hoping that this will prolong the life of the elastic and the pul. Even if I have to buy a new set for my neXT baby after using this stash for 2 or more years I still save thousands of dollars! I recommend these to everybody I know that is thinking of cloth diapering or already cloth diapering. Love love love!!

Rating: 2 of 5 Stars! [2 of 5 Stars!]
Reviewed by Rebekah on Sunday 23 August, 2015
Cotton Babies Verified Purchase

I wrote an honest review of this diaper on this page before, but the cottonbabies people very quickly removed it. I used to absolutely love these diapers, until recently. They were my favorite diapers in our stash and we have at least 30 of them. We also supplement with prefolds and few other brands of pocket diapers, but these are the dominant diaper in our stash. I used them on our first child for about 2 years and our second child has been in them for almost 2 years (not yet potty trained). Shortly after our second child was born, I realized all the elastics were stretched out, so I replaced them all in the hopes that that would prolong the life of our diapers – and it did, thankfully! (I consider that normal maintenance for cloth diapers which I expected to need to do at some point.) However, in the last 6 months or more I have begun to notice parts of the PUL are actually cracking and developing holes. In most diapers, this is occuring in the strip of PUL at the top inside margin of the diaper that touches the baby’s belly. On a side note, I have only ever washed my diapers according to manufacturer instructions, with cloth-safe detergent, and I do not put them in the dryer ever. So I was very disappointed to see this happening, and when I contacted the customer service to ask if they have seen this before, and if they really expect their diapers to not last through 2 children, her response was “that is considered normal wear and tear.” I’m sorry, but I completely disagree. This is a quality issue, the PUL is literally falling apart which is now affecting the function of the diapers. And this has begun to happen in at least 8 of my diapers. When I spent the $$$ up front with my first child to cloth diaper instead of using disposables, I had hoped to be able to use them for all my children, but they are not even going to last through my second child. This is EXTREMELY disappointing, and even more disappointing is the way the customer service has handled the issue. I really want to be able to recommend these diapers to my friends when they talk to me about cloth diapering, but I don’t feel that I can do that anymore. Looking at the possibility of needing to re-purchase my entire stash in the next few months, this makes me seriously regret choosing this product.

Rating: 5 of 5 Stars! [5 of 5 Stars!]
Reviewed by Maetzin on Saturday 12 April, 2014

I have to admit. I was scared to try the BY 4.0's because of their bad reviews about their elastic. But one day I finally decided to try out a few. I own so many cloth diapers from many different brands and I have some I hate and some I love. But once I tried out the B'S 4.0 dipes. I was totally in love. These are now my favorite go to dipes everyday. I had to get more and my stash is budding up more of 4.0's. We love them. We have never had leaks or any sort of problem with these. And we have a heavy wetter. Sleeps through the night with both inserts. Love them. My mom baby sits my kids and she never complains when she uses these on my baby. I definitely recommend them. They are much better than the freetimes. I like the idea of the free times but those leak on us every single time. Even my mom hates them.