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
The Happy Nappy™ component of the Happy Nappy Swimsuit™ requires a correct fit for complete solid leak protection. Since babies vary in size, it's essential to measure your baby accurately and consult the size guide to ensure you purchase the right size.
Measure your baby while lying flat and not immediately after a feed. Take measurements around their tummy, across the belly button, and at the fullest part of their thigh. When worn, there should be enough space to fit a finger comfortably around the edges of the seal, with no red marks.
As with disposable swim diapers, the Happy Nappy™ within the Happy Nappy™ Swimsuit does not hold in urine. It is designed to allow water to pass in and out of the diaper to prevent it from becoming waterlogged. However, it is incredibly reliable in containing solids.
No. The Happy Nappy™ is designed to be used without any other swim diaper
underneath and can be worn in this way for general swimming, inflatable pools or the ocean. However, some organised swimming classes require a double diaper system; in such cases, you will also need to purchase a Silver-Lining or Cotton diaper Wrap to wear underneath. This system can also make changing and washing a soiled
Happy Nappy™ easier.
To keep your Happy Nappy™ Swimsuit in good condition, we recommend hand washing in cool water and drying away from direct sunlight. However, we understand that soiled diapers may occasionally require machine washing. If you need to machine wash, please do so at 85°F using a non-biological detergent. Please note that frequent machine washing may affect the longevity of the product.