Best Swim Diapers Reviewed and Rated

When summer comes along, we all want a good and enjoyable way to cool off, relax, and have a little fun. That’s true for parents too! We don’t want to have to forgo the pools and the beach just because we have a little one, and we don’t want to leave our little ones out either! However, when it comes to kids that aren’t quite yet potty trained, pools and other bodies of water can be tricky. The last thing any of us want is to cause a full-blown pool evacuation. How embarrassing and inconvenient that would be! Fortunately, there are these awesome things called swim diapers specifically for babies and young kids to use in the pool.

Our Top 3 Picks

I Play
  • I Play
  • 5 out of 5
    Our rating
  • Confortable
  • Price: See Here
AppleCheeks
  • AppleCheeks
  • 4.6 out of 5
    Our rating
  • Adjustable
  • Price: See Here
Alva Baby
  • Alva Baby
  • 4.3 out of 5
    Our rating
  • Inexpensive
  • Price: See Here

Swim diapers are designed to hold in all solid messes while letting water pass through freely. This is a perfect design for the pool or other water that you might bring your baby along in. Just like with regular diapers, there are both disposable swim diaper options as well as reusable swim diaper options. Whether, you use reusable or disposable diapers regularly doesn’t have to determine what type of swim diapers you use as there are different benefits to each. It really is just a personal preference of what works best for you. If you are only planning on getting your little one into the water every now and then, you may decide to choose disposable swim diapers. However, if you are going to be frequenting the water, it might be wise to choose a reusable option.

10 Best Swim Diapers

 

1. i play

1. i play
In the top spot on our list is the i play Reusable Swim Diaper. This is an extremely popular brand of reusable swim diapers and is very well-loved. Made of three different layers, it is multi-functional and very effective at doing its job. The elastic around the legs and waist of this diaper help to hold all messes in very well and avoid any poo getting into the pool. It even has some useful snaps on one side of the diaper to make it a bit easier to get the swim diaper off of your child, especially if the swim diaper is soiled. It can be used as swimsuit bottoms or it can be used underneath your child’s swimsuit. It comes in a large variety of different colors and sizes to fit the preferences and needs of anyone. It is, of course, machine washable and made of 100% polyester.

Innovative 3-Layer Design

This particular swim diaper is very unique in its 3-layer design. Each one of the three different layers serves its own unique purpose. The outermost layer of the diaper is the waterproof layer which is absolutely essential at keeping in those dirty messes that would be both highly inconvenient and downright unsanitary to leak into the water. The innermost layer of the diaper which sits against your little one’s skin is made of a wicking material that helps to pull moisture away from your baby’s skin to help them be more comfortable and to help prevent rashes from occurring. The middle layer of this 3-layer diaper is the really unique part. It is actually a thin absorbent layer which most other swim diapers do not have. This thin absorbent layer is to help prevent any messes while the baby is not in the water. For example, if your little one pees on the way to the pool, this layer will absorb it so that it does not get all over the place.
Expand to see more
Features and Specifications

3-layer design
Absorbent
Waterproof
Newborn-4T
Leg and waist elastic
Easy-lock snaps
Comfort seams
Economical
Environmentally friendly

Price/Value

This swim diaper from i play comes in near the low-end of the prices on this list, and is therefore very affordable. When you take a look at this swim diapers unique design and plentiful features, you really can’t deny its impressive value. This swim diaper certainly falls into almost any budget.

Conclusion

The i play reusable swim diaper is an amazing choice for any family planning to bring a child that is not fully potty trained into the pool or to the beach. It is very affordable, absolutely adorable, impressively useful, and reusable. You really can’t go wrong with this diaper!
Pros
  • Absorbent layer holds urine in when outside of the water
  • Wicking liner helps to prevent diaper rashes
  • Leg and waist elastic prevents leaks
  • Designed to be exceptionally comfortable
  • Sizes are available for newborns all the way up to children in size 4T
  • Washable and reusable design is better for the environment
Cons

Sizes tend to run small

2. AppleCheeks

2. AppleCheeks
This is an extraordinarily adorable swim diaper from a highly-trusted cloth diaper brand, AppleCheeks. It is designed in a very stylish way and it closes using snaps on each side of the diaper. It is well-designed to keep all solids from escaping the diaper to protect from embarrassing accidents in the pool or other bodies of water. It comes in a variety of fun prints and colors, and is available in 2 different sizes. Size 1 fits babies that are 7 pounds all the way up to 20 pounds, and size 2 overlaps that slightly starting at 18 pounds and going all the way up to 35 pounds. This allows it to fit most newborns as well as most older toddlers. Its two different layers made of 100% polyester allow water to freely move through the diaper while catching any solids that try to pass through. This is great because it prevents water from getting stuck within the swim diaper and weighing the child down. It is very comfortable for your little one, too!

Two Rows of Snaps

It is special because it has 2 separate rows of snaps to help ensure the best fit possible. The top row of snaps allows you to adjust the diaper for the best possible fit around their waist, while the bottom row of snaps, which is independent of the top row of snaps, controls how snugly the diaper fits around the child’s thighs. Since all babies are shaped differently, this can be a really helpful way to ensure the best possible fit of your specific child. Getting a good, snug fit helps to ensure that the diaper does its job properly and keeps all solids within the diaper.
Expand to see more
Features and Specifications

2 rows of snaps
Elastic at waist and thighs
Stylish design
2 layers
7-35 pounds with 2 sizes
100% polyester
Soft and comfortable

Price/Value

This is actually among the priciest choice to make it on our list, but that does not mean that it is at all lacking in value. In fact, considering the highly-trusted brand, great style, and good functionality of this swim diaper, you can really see that this diaper has amazing value and is well-worth its slightly higher price.

Conclusion

If you are after a higher-end cloth swim diaper, this is certainly the diaper for you. It is very effective as well as stylish. You don’t have to question the quality of this swim diaper because it comes from a well-trusted and known brand of cloth diapers. Even with the higher cost, it can still be an economical choice since it is reusable.
Pros

Highly adjustable for the best fit possible

Designed to both look and feel great

Effectively holds in solids with 2 layers and elastics

Sizes available to fit almost any child that hasn’t been fully potty trained

Comes from a highly-trusted cloth diaper brand

Can be washed and reused repetitively

Cons

More expensive than other options

3. Alva Baby

3. Alva Baby
Here are some impressive swim diapers. These great swim diapers from the popular cloth diaper brand, Alva Baby. They are lightweight, easy to use, easily adjustable, and effective. The outer layer of a waterproof material known as PUL keeps solids inside and the inner layer of mesh makes clean up easier and keeps your little one nice and comfortable. The lightweight design keeps your child able to move more freely through the water and helps them to more easily learn how to swim. The stretchy elastics around the waist and legs provide a better fit and are bound in a soft lyrca to keep your baby as comfortable as possible while wearing the swim diaper.

One Size Design

This swim diaper from Alva Baby is ingeniously designed in a one-size-fits-all style. Thanks to its stretchy leg and waist elastics in addition to its multiple snap positions that are fully adjustable, this diaper can be worn by practically any sized child that is not yet fully potty trained. Its special design and multiple snap positions allow this single swim diaper to snugly fit onto a child from just 10 pounds all the way up to 40 pounds.
Expand to see more
Features and Specifications

One-size
Adjustable
10-40 pounds
Lightweight
Lyrca bound elastics
Inner mesh layer
Outer PUL layer

Price/Value

These are the most inexpensive reusable swim diapers on the list making them the most economical choices for most families. They are very reasonably priced, but are not lacking in quality, so they have impressively high value.

Conclusion

This can definitely be a wonderful choice of swim diaper for any family! They are very affordable and still
work great and are super cute, so they are especially a good choice for anyone looking for a great deal on an awesome product!
Pros

Designed to fit newborns all the way up to preschoolers

Made to be very comfortable for your child

Effectively holds in solids

Is very inexpensive

Comes in cute prints and designs

Cons

May hold water in when out of the pool

4. Babyganics Disposable

4. Babyganics Disposable
These diapers snag the top spot of disposable swim diapers to make it on the list! They have some cool features that set them apart from all other swim diapers and do their job very well. They are designed as one-use items and are not washable so you can simply throw them away when you’re done instead of bothering with washing them! They come in multiple sizes to best accommodate your baby and fit snugly to prevent any solids leaking out. Whatever the swim diaper covers is protected from the potentially dangerous UV rays from the sun. They are also designed with a sustainable core that won’t sag or well up in the water. They are pull-up style to put them on, but then they have pull-away sides that allow for easy changes, especially when they are soiled and you need to avoid a mess when pulling the swim diaper off of your baby.

Color Changing Safety Feature

This particular swim diaper has one really cool and unique safety feature, too! It has a cute frog design on the front of the diaper which actually begins to change color when exposed to the sun. It will slowly change color in the sun and when the baby has been in the sun for a certain period of time, the frog will become brown rather than the green color that it starts out as. This is an indication that it is time to check your baby’s diaper and that it is time to reapply sunscreen to protect your baby from the potentially dangerous UV rays of the sun.
Expand to see more
Features and Specifications

Color-changing frog design
UV rays protection
Disposable
Snug-fitting
Pull-up style
Pull-away sides
Sustainable core

Price/Value

These are the most expensive disposable swim diapers to make the list, but are still fairly affordable, as long as you won’t be taking your child into the water quite often. They have some really cool and unique safety features, so they definitely have a good value.

Conclusion

If you prefer a disposable swim diaper over a reusable one, this can definitely be a great choice and is well-worth your consideration. They are pretty effective, affordable, and the unique safety features can be a great draw for many people!
Pros

Sustainable core prevents swelling and sagging

Disposable design is exceptionally easy

Safety features help protect your child from the sun

Snug fit helps to hold in all solids

Designed to be comfortable for your baby

Cons

Can’t be reused

Fit is not adjustable

5. Pampers Splashers

5. Pampers Splashers
These come from one of the biggest names in diapers – Pampers. So, you really don’t need to worry about the important things like quality and safety. They are well made and effective swim diapers that can be thrown out after use. They are incredibly well-designed and fit very snugly, although they are not adjustable. They slip on like underwear, but they are designed to easily pull apart at the sides just like regular diapers do which can be very helpful and useful if the swim diaper does become soiled. They hold solid waste in, even while in the water, but they are smartly designed so that they do not hold in water causing them to swell up or sag. They won’t hold in water when your baby is not in the water. They are also very nice and trim which is great for fitting them well under your child’s swimsuit.

Double Leg Cuffs

These well-designed diapers feature double leg cuffs which is a very useful and helpful feature that most of the other diapers do not have. The really cool thing about these diapers having these double leg cuffs is that it provides a second layer of protection to prevent solids from escaping the diapers and making an embarrassing mess in the pool or other bodies of water.
Expand to see more
Features and Specifications

Double leg cuffs
Stretchy elastic
Pull-up style
Pull-away sides
Disposable
Comfortable

Price/Value

These are the most inexpensive diapers on the list, and still work amazingly well and even come from a highly-trusted diaper brand. They are quality diapers at a great price with a wonderful value.

Conclusion

There is no doubt that these disposable swim diapers are a great purchase with an excellent value to them. They are of good quality, fit well, hold in solids well, and have some great features to make them easier to use. They even have the double leg cuffs for added security. If you prefer a disposable swim diaper or if you don’t plan on getting your little one in the water very often and need an affordable solution, this could very well be the perfect swim diaper option for your family.
Pros

The double leg cuffs provide extra protection against leaks

Can be thrown away for extra easy use

Are designed to be very comfortable for your child

Work effectively to hold in solid waste

Come from a very well-trusted brand

Cons

Can’t be reused

Not adjustable

6. Kushies

6. Kushies
Here is an exceptionally cute swim diaper that can either be worn as a swimsuit or underneath a different swimsuit. It is an effective way to hold solid waste in the diaper while your baby is in the water such as a pool, lake, or even the beach. It has an adorable and functional design. It is a wrap style diaper that goes around your baby and then fastens using hook and loop closures commonly known as Velcro. This allows for a fully-adjustable, customized fit for your baby specifically. It comes in a wide variety of cute prints making it perfect if you do choose to use it as a swimsuit bottom, but is nice and trim which is great if you choose to use it underneath a different swimsuit. Made of fast-drying nylon in addition to a soft terry liner, this swim diaper allows water to comfortably move in and out of the diaper while containing all solid waste.

Securing Ties

This swim diaper closes using hook and loop closures which is absolutely wonderful for ensuring a perfect fit that is fully customizable for your specific baby. However, the hook and loop closure has one downfall which is that it might not be quite as secure as snap closures. With hook and loop closures, some parents worry about the risk of the diaper getting pulled off in the pool. While this is unlikely, Kushies has taken an extra step to ensure that it does not happen. Their awesome swim diapers feature ties on each side of the diaper that allow you to tie a little bow in the front of the diaper which completely secures the diaper from accidentally coming off.
Expand to see more
Features and Specifications

Wrap-style diaper
Hook and loop closure
Securing ties
Soft terry liner
Fast-drying nylon
Cute prints and design

Price/Value

It comes in at the middle of the list in regard to the cost, and certainly has great value. Its cute and stylish design paired with its good functionality and unique tying feature give it a really good value, especially when you consider its affordability as well.

Conclusion

There are a lot of great things about this diaper like how it can be made to perfectly fit your specific child and how it secures so easily. It is amazingly adorable with a great design that can be used as a swimsuit or underneath a swimsuit and it, of course, does a great job at holding solid waste in to prevent any from entering the water your child is in. It can really be a wonderful choice for anyone, especially If you do want a diaper that will make super cute swimsuit bottoms while also functioning exceptionally well.
Pros

Designed to give a fully customized, snug fit

Made to be comfortable for your child

Secures closed with ties to prevent diaper from accidentally coming off

Plenty of print options with a stylish design

Nylon dries quickly for convenience

Trim enough to be worn underneath a swimsuit

Cons

Hook and loop closure can get caught on other things in wash

7. Beau & Belle

7. Beau & Belle
The Nageuret Reusable Swim Diaper is an impressively well-designed and very high-quality. It is an attractively designed diaper that works very well. Its outer shell is made of PUL which is a waterproof fabric and does a great job at holding solids in the diaper to prevent embarrassing pool evacuations. It comes in multiple cute designs so that it can easily be used as the bottom of a child’s swimsuit or it can be used underneath a different swimsuit if you prefer. The inside of the swim diaper is made of an extra soft polyester mesh fabric that keeps your little one nice and comfy and also helps to make messes easier to clean up. It features a multitude of snaps that allow it to grow with your baby and give an ideal fit for your little one as well. It is designed to be one-size which means that it can fit babies from 8 pounds all the way up to 36 pounds.

Charitable Donations

Beau & Belle Littles is a small family-owned company in Colorado, and one of the coolest things about their company is that they have made the decision to give back. Each year, Beau & Belle Littles donates 5% of their sales to an organization called Compassion International which does a variety of things in order to help children in need.
Expand to see more
Features and Specifications

High-quality materials
One-size design
8-36 pounds
Cute patterns
PUL outer shell
Soft mesh lining
Snap closures

Price/Conclusion

This is one of the priciest swim diapers on our list but it makes sense that it would cost a little more than some of the other options. It is made of exceptionally high-quality materials and has an excellent design that allows it to be used from the time your baby is very little all the way up until potty training in most cases. It really is a good swim diaper with good value to it.

Conclusion

There is no doubt that this is an excellent choice for a swim diaper. It is made well and will last a long time. Even though it is a little pricier than a lot of other options, it is still an economical choice because it will last so long. This is especially true if you plan on being in the water with your little one a lot. It even has the benefit of contributing to charity when you purchase it!
Pros

Designed to be exceptionally comfortable for your child

Holds solid waste in very well preventing leaks

Cute patterns make for a great swimsuit

Easy to wash and reuse over and over

Fits well for small babies up through big toddlers

Your purchase goes to help a charity for children

Cons

Can be bulky on smaller babies

Pricier

8. Bummis Swimmi

8. Bummis Swimmi
The Swimmi swim diaper from Bummis is yet another amazing option for a reusable swim diaper that can be washed and used over and over. It is expertly designed to not only do its job of holding in solid messes well, but also to be nice and comfortable and even look great as well! It comes in super cute prints that will work wonderfully as a swimsuit for your child, but they can also be used underneath another swimsuit instead if you prefer. The inside of the swim diaper is a soft mesh that keeps your baby comfy while also keeping clean-up easy and simple. The outer layer of cotton is nice and soft with a super cute print. Sandwiched in-between these two layers is a layer of coated nylon that keeps all the solids nicely contained in the diaper. The stretchy lyrca bindings around the edges of the swim diaper give it a nice stretch for a good fit and are very comfortable for your baby. It comes in 3 different sizes to give a nice fit to children of different sizes from 9 pounds up to 30 pounds.

Highly Customizable Fit

This Swimmi diaper is designed to fit exceptionally well with its hook and loop closure. Not only does the hook and loop closure allow you to achieve the perfect snugness for your child, but the area where the tabs can connect to on this diaper specifically is larger than average, leaving an even greater range of possibilities of where to place the tabs which allows you to get an even better fit than other swim diapers closing with hook and loop closures.
Expand to see more
Features and Specifications

Hook and loop closure
Coated nylon
Soft mesh liner
Cute cotton prints
9-30 pounds with 3 sizes
Lyrca bindings

Price/Value

This is another one of the more expensive swim diapers on the list, but it is made exceptionally well and is able to provide a very customized, snug fit so that it is highly effective at containing solid waste in the water. For these reasons, even with its higher price, it still has a really good value.

Conclusion

This is a great swim diaper with good value to it. It is made well and designed well and does its job wonderfully. It is a little pricier, but if you are willing to pay for the best fit possible for your child’s swim diaper, this can really be a wonderful choice for you.
Pros

Hook and loop closure designed to give highly customizable fit

Designed to keep your child comfortable

Coated nylon effectively contains solids

3 different sizes give good choices for a variety of different sized children

Lyrca bindings provide softness and stretchiness for improved fit

Cons

One diaper won’t last as long as many other choices

9. Huggies Little Swimmers

9. Huggies Little Swimmers
From another very big name in diapers, Huggies, comes these great Little Swimmers disposable swim diapers. They are designed with comfort and functionality in mind. The stretchy sides help to achieve a good and snug fit. They are designed to pull up onto your child just like pants, but then can be removed easily with the rip-away seems on the sides just like a regular disposable diaper. Leak guards on the legs of the diapers help to prevent the leaking of any solid waste from the diaper into the water. They have cute and colorful designs and feature popular characters that are sure to be well-loved by children.

Unique Absorbent Material

Something that sets these swim diapers apart from other ones is that they actually do contain some absorbency. Most swim diapers, both cloth and disposable, are not designed to absorb at all, but these diapers have a small amount of a special absorbent material. They won’t work like a regular diaper, but they are effective to hold in some urine if your child happens to pee prior to entering the pool. The great thing about this is that even with the absorbent material, this diaper won’t swell up or sag in the water of the pool, lake, beach, or any other water you may take your little one along in.
Expand to see more
Features and Specifications

Unique absorbent material
Stretchy material
Rip-away seems
Popular characters
Bright colorful designs
Disposable
Leak guards

Price/Value

These Huggies Little Swimmers are the priciest disposable swim diapers on the list, but they do work very well and provide the unique feature of holding in a small amount of urine prior to entering the water. For this reason, they certainly have a good value.

Conclusion

If you plan on doing a lot of swimming with your little one, these may not be the ideal swim diapers for you because of the cost. However, if you just plan on swimming a few times throughout the summer, they can really be a great choice with some cool features if you prefer to go with disposable swim diapers.
Pros

Effectively designed to hold in solid waste

Can be thrown away for convenience

Colorful designs and popular characters make kids happy

Stretchy material provides an excellent fit

Cons

Most expensive disposable swim diapers on the list

10. Charlie Banana

10. Charlie Banana
Here is another very cute reusable swim diaper that comes from Charlie Banana – a popular cloth diaper brand. It is a little different than most of the other reusable swim diapers because it does not use snaps and it also does not have a hook and loop closure. Instead, it simply pulls up like any other swimsuit bottom. The elastic around the waist and legs in addition to the waterproof outer layer makes it super secure and prevents any solids from leaking out of the diaper and into the water. It is hypoallergenic and free of perfumes, chlorine, and other chemicals.

Organic Cotton

The innermost layer of this reusable swim diaper is made out of an organic cotton material. This material is superiorly soft to keep your precious baby very comfortable. The fact that it is organic allows you to rest assured that only the best of the best is touching your baby’s skin and you don’t have to worry about excessive pesticides, chemicals, or other dangerous substances in the lining. It also means that the production of the material was much less harmful or dangerous for the environment compared to other materials that are not made organically.
Expand to see more
Features and Specifications

Waterproof outer shell
Organic cotton lining
Pull-up style
Perfume-free
Chemical-free
Waist and leg elastics

Price/Value

This is a relatively inexpensive swim diaper. It looks really nice and fits snugly on your baby to effectively contain solid waste while your little one is in the water. Overall, there is no doubt of its great value!

Conclusion

This is an all-around great reusable swim diaper. It is designed very well and effectively does its job of holding in solid waste to prevent embarrassing accidents in the pool or at the beach. If you are prefer the pull-up design and want a diaper that you can wash and reuse, this certainly might be the perfect diaper for you.
Pros

Designed with your child’s safety in mind

Made to be superiorly comfortable for your child

Pull-up style design is easy to use

Free of potentially dangerous substances such as perfumes and chlorine

Comes in a variety of cute styles and colors

Cons

Changing a soiled diaper may be more difficult without snaps or hook and loop closure

Criteria for Evaluation

Functionality

Swim diapers are the type of product that you have to be able to really rely on when you need them. If they don’t work when you need them to, it could leave you in a very embarrassing and inconvenient situation. That is why we paid extra attention to the designs and functionality of the swim diapers we evaluated and made sure to only include swim diapers that really work and do their job well.

Safety

When it comes to our children, safety is extremely important. So, the products we buy for our children need to be safe for them. We should never have to question the safety of a product that we buy for our children. We looked through tons of different swim diapers when making our list and made sure that all of them are designed in a way and with materials that are completely safe for your little one because we know how important it is to you to keep them nice and safe.

Comfort

Swim diapers are an item that sits directly against some of the most delicate and sensitive parts of your baby for sometimes extended periods of time. The last thing we want is for them to be uncomfortable for your child to wear. You need something that doesn’t just work well, but feels good for your child, too. Since we understand the importance of keeping your little one comfy, we looked at the comfort of each swim diaper before we put together our list of the best swim diapers.

Appearance

This probably won’t be your number one concern, but it is certainly still relevant. In addition to a good working product, you also want something that looks really great too. There is nothing cuter than a baby in an adorable swim diaper! We chose a variety of different swim diapers with different colors, prints, and styles. That way, everyone will have a great option for them and their little one!

Price

There is no questioning the importance of the cost of any product that you are going to purchase. You need to consider what your budget is and choose a product that works well for your family price-wise without sacrificing function and style because what is really even more important than just the price tag of a product, is the value of the product. We chose all high-value products that fit well within a variety of budgets so that there would be a great swim diaper for any family on our list.

User Reviews

You can read the information, specs, and features of a product from the manufacturer all day, but the best way to get a real, honest view of what a product is actually like is to look at user reviews of the product. We consider this one of the most important aspects of our evaluation process because we want to tell you exactly what you have to expect from a product once you actually have it and use it. The best way to find that out is to see what the real people that have already purchased and used the product think of it.

FAQs

Does my baby have to wear a swim diaper in the water?

Some pools require babies and children that are not potty trained to be in a swim diaper when in the water, but even if you are taking your baby into water where it is not required, you may want to strongly consider it. If your baby were to have a bowel movement in a pool, it would need to be completely drained and then re-filled. If your baby has a bowel movement in the ocean or a lake or something, it might not be as big of a deal, but it can certainly still be messy and inconvenient.

Can my baby just wear a regular diaper in the water?

It is not a good idea to have your baby wear a regular diaper into the water. Regular diapers are designed to absorb liquid and would immediately become water-logged. It would weight your baby down and make them uncomfortable most likely as well. Additionally, once it fills with water, it would be useless at holding anything in.

Should I choose reusable or disposable swim diapers?

It is completely up to you to use either reusable or disposable swim diapers. Both have advantages and drawbacks and you just need to consider what is best for your family. It can definitely be more cost effective to choose reusable swim diapers if you are planning on being in the water a lot with your little one. If you are only going to take you little one into the water once or just a few times, a pack of disposables might get you through just fine.

If I choose reusable swim diapers, do I need more than one?

If you choose reusable swim diapers, it is best to have at least 2 swim diapers so that if your baby does have a bowel movement while you are swimming, you can change them into the spare diaper so that you can continue swimming. If you swim very frequently, you may want even more than 2 reusable swim diapers.

Do swim diapers catch urine as well as stools?

Swim diapers are designed to allow water and other liquids to pass freely through them, but catch and contain solids such as bowel movements. Some swim diapers do catch a small amount of urine if the urination occurs before the baby enters the water, but generally speaking, swim diapers do not absorb urine.