Shop kids' swim diapers for babies and toddlers. Reusable and disposable options contain solid waste in the pool without absorbing water. Swim diapers are required at nearly all public pools, swim schools, and splash pads for children who aren't fully toilet-trained. Our collection includes reusable swim diapers from FINIS, Cressi, My Pool Pal, Sporti, and Freds Swim Academy, plus disposable options. Sizes range across infant (0–6 months), baby (6–18 months), and toddler (2T–4T). Pair with our full kids' swimwear collection for a coordinated look.
Reusable vs. Disposable Swim Diapers
Reusable swim diapers are made from polyester, spandex, or laminated fabrics with snug elastic leg openings. They cost $10 to $18 upfront and wash hundreds of times, so they save significant money over a swim season. Most have adjustable snaps or drawstrings that grow with the child. Disposable swim diapers like Huggies Little Swimmers and Pampers Splashers are single-use at roughly $0.50 to $1.00 per diaper. Disposables work well for vacation or occasional pool days. Reusables make more sense for weekly swim lessons. Many parents keep both on hand: disposables for travel, reusables for regular pool use.
Swim Diaper Rules at Pools & Swim Schools
Public pools, swim schools, and splash pads universally require swim diapers for children who aren't reliably toilet-trained. The CDC specifically recommends swim diapers to reduce the risk of recreational water illness outbreaks. Most facilities require the diaper to fit snugly around the legs and waist with no gaps. Many also require a second layer (a reusable swim diaper over a disposable, or a snug swimsuit over the diaper) for added containment. Check your pool's specific rules before the first visit. Some facilities allow only reusable swim diapers. Others accept both. For boys specifically, see our boys' swim diapers collection.
Sizing by Age & Weight
Swim diapers are sized by weight rather than age, similar to regular diapers. Typical size ranges: small (10–18 lbs, roughly 0–9 months), medium (18–28 lbs, roughly 9–24 months), large (28–35 lbs, roughly 2T–3T), and extra-large (35–45 lbs, roughly 3T–4T). Reusable swim diapers with adjustable snaps span a wider weight range than disposables, which makes them more economical. For the best fit, the diaper should sit snug at the legs and waist with no visible gaps. Gapping at the thighs defeats the purpose of the diaper. Once your child outgrows swim diapers, our kids' swim goggles and learn-to-swim gear support the next stage.
Kids' Swim Diapers FAQ
Do swim diapers actually work?
Swim diapers are designed to contain solid waste (poop), not urine. When they fit properly, they do that job well. Urine passes through because a swim diaper that absorbed liquid would swell up with pool water and become heavy and uncomfortable. For public pools, containing solids is what matters for sanitation. The CDC endorses swim diapers as an important part of reducing recreational water illness outbreaks. Make sure the diaper fits snugly around the legs. Gaps at the thigh openings are where containment fails.
Do swim diapers hold pee?
No. Swim diapers intentionally let urine pass through into the pool water. A swim diaper that absorbed urine would also absorb pool water, causing it to swell, sag, and become uncomfortable (and dangerously heavy) within minutes. Chlorine in public pools is designed to neutralize urine. The real concern is fecal contamination, which is what swim diapers are engineered to contain. If you need urine containment, no swim diaper can do that. Encourage small children to use the bathroom before and during pool sessions.
Do you put a regular diaper under a swim diaper?
No. Never wear a regular diaper under a swim diaper. Regular diapers are designed to absorb liquid, so they'll soak up gallons of pool water, swell to several times their normal size, and become heavy, sagging, and unsafe. Swim diapers are worn alone, or with a snug swimsuit over the top for extra containment. If your child isn't at the pool yet, put a regular diaper on until you arrive. Change into a swim diaper in the changing room just before getting in the water.
What's the difference between regular diapers and swim diapers?
Regular diapers are built to absorb liquid. They contain super-absorbent polymers that pull moisture away from the skin. Swim diapers deliberately don't absorb. They use water-repellent or quick-drying fabric with snug elastic legs designed only to contain solid waste. A regular diaper in the pool will balloon up in minutes and fall apart. A swim diaper stays the same size in the water and lets urine pass through while holding solids in.
How do you wash a reusable swim diaper?
Rinse the swim diaper thoroughly in cool water after every pool use to flush out chlorine and any residue. For solid-waste accidents, shake contents into the toilet first, then rinse. Machine wash with regular detergent. Skip fabric softener, which degrades the waterproof layer. Air dry only. The dryer can damage the elastic and laminated fabric. Most reusable swim diapers last an entire swim season or longer with proper care.