Happy Nappy™ Swimsuit
The Happy Nappy™ Swimsuit is our award-winning one-piece baby swimsuit, with the Happy Nappy™ swim diaper built right in. Your baby is ready for the pool in one easy layer, from their very first lesson.
It's the same neoprene swim diaper that parents and swim schools trust, with a swimsuit around it. That's one less thing to wrestle on at the poolside.
Which Happy Nappy™ Swimsuit Print Will Your Baby Love?
We make it in five prints, all built on the same fit. Daisy Bee, Sunny Bear and Nina's Ark are classic one-pieces, while Strawberry Field and Lilac Spring add a frill at the hips.
Whichever you choose, ribbed neoprene seals at the waist and thighs hold solids in. Pool water flows freely through, so the suit never turns heavy, and for everyday swimming there's no separate swim diaper to put on underneath.
Finding the Right Size, From Newborn to Toddler
The swimsuit comes in five sizes, starting at 0 to 4 months and going up to 2 to 3 years. Our Happy Nappy™ swim diaper size chart lists the waist, thigh, chest and body length for each one. A swimsuit has to fit your baby's body as well as their legs, and a good fit usually sits snugly at the waist and thighs without leaving deep red marks.
Measuring tends to beat going by age, since the bands don't quite match our standalone swim diaper. The smallest swimsuit covers 0 to 4 months, while the smallest diaper covers 0 to 3.
If your toddler has outgrown the 2 to 3 year swimsuit but is still in lessons, the Happy Nappy™ swim diaper in 3-4 years keeps going, with a 4 to 5 year size after that.
Buying Your Splash About Happy Nappy™ Swimsuit Direct
The Happy Nappy™ is our own design, so every swimsuit here is the real thing. If you searched for a "Happy Nappy™ swim diaper near me" to find us, we deliver across the US and Canada, so the closest one is your own front door.
Browse the prints below, and if you're not sure which size to choose, get in touch and we'll help you pick.
Happy Nappy™ Swimsuit FAQs
No. Like disposable swim diapers, the Happy Nappy™ lets urine pass straight through, which stops it filling with pool water and getting heavy. What it does hold in is solids, thanks to the snug seals at the waist and thighs. Change your baby into a regular diaper as soon as they're out of the water.
Yes. The Happy Nappy Duo™ swim diaper fits just like our standard Happy Nappy™, with an extra inner layer developed to help protect against germs. Most US swim schools recognize it as a double diaper system, so your baby doesn't need another swim diaper underneath.
Nothing extra, for everyday swimming. The Happy Nappy™ Wetsuit has the swim diaper built in, so it goes on straight against your baby's skin, just like the Happy Nappy™ Swimsuit. If your swim class asks for a double diaper system, add a Silver Lining under-diaper beneath it.
It's our reusable neoprene swim diaper, designed to contain solids and stop leaks into the pool. You can buy it on its own or find it built into our swimsuits and wetsuits, and because it's reusable, you simply wash it after each swim rather than throwing it away.