Happy Nappy™ Swim Diaper
First swim coming up? The Happy Nappy™ Swim Diaper is the reusable neoprene swim diaper we invented, and parents and swim schools have trusted it since 2005.
Soft 1mm neoprene cups your baby’s bottom. The waist and thigh seals sit snug without tight elastic, so solids stay in and the seals usually leave no red marks. It fits babies from 0 to 3 months and toddlers up to 4 to 5 years.
Sizing Your Reusable Swim Diaper for Babies and Toddlers
Age is only a guide. The 6 to 12 month size alone covers almost three inches of waist, so we size by measurements rather than the label, and the right size slides a finger under the seals without leaving red marks.
The two biggest sizes come in selected prints. Toddlers who’d rather wear shorts like the big kids can move up to Splash Jammers, which start at 2 to 3 years and keep solids in the same way.
Two reusable swim diapers on rotation typically see you through a swimming journey, because they dry quickly between lessons.
Does Your Swim Class Need a Double Diaper System?
Some swim schools ask for one, and your instructor can tell you if yours does. If it doesn’t, the Happy Nappy™ works on its own for general swimming, inflatable pools or the ocean.
If your class does, the Happy Nappy Duo™ has a second inner layer, scientifically proven to kill germs, and meets most US swim schools’ double diaper system requirements with nothing underneath. Prefer to keep the Happy Nappy™ you already own? Add the Silver Lining Diaper Wrap, which won Platinum in the Best Swim Invention category at the Organic Baby Awards 2024, or a Diaper Wrap with liners from our Double Layer Diaper System range.
Frequently Asked Questions
Not unless your swim class asks for one. The Happy Nappy™ is designed to be worn on its own, and its seals keep solids in without anything underneath. If a class wants a double diaper system, a disposable swim diaper, the Silver Lining Diaper Wrap or a Diaper Wrap with liners all work as the second layer.
Only if your swim class asks for a double diaper system, and then it should be a swim diaper or a wrap, never a regular diaper. A regular diaper soaks up water, swells, gets heavy and pulls down. The Happy Nappy Duo™ has its own inner layer, so it needs nothing underneath.
Right here on our US site, in all our current prints and sizes. Browse the collection below, and if it’s your first one, measure your baby before you pick a size, because we can only take back unworn items within 30 days.
For most babies, a reusable swim diaper that seals snugly at the waist and thighs, because that seal is what keeps solids out of the pool. That’s why the Happy Nappy™ tops our list of the best swim diapers. If your class wants a double diaper system, the Happy Nappy Duo™ is the better pick.
Go by measurements rather than age, since babies the same age can be very different sizes. Lay your baby flat, ideally not straight after a feed. Measure around the tummy across the belly button and around the fullest part of the thigh, then check both against our Happy Nappy™ swim diaper size chart.
No, and it isn’t meant to. A swim diaper is there to keep feces out of the pool. Water flows in and out so it never gets heavy, which means urine passes through, just as it does with disposable swim diapers. Change your baby into a regular diaper as soon as they’re out of the water.
Yes. Sizes go up to 4 to 5 years, with the two biggest in selected prints, so it suits potty training toddlers as well as babies. Excited toddlers often forget to say they need to go, so plan a potty break every 30 to 60 minutes, because no swim diaper holds urine.