• Award
    Award Winning Baby Swimwear Range
  • Van
    Free Delivery on orders over £9.99
  • Globe
    World's Largest Range of Baby Swimwear
  • Swimmers
    Recommended by Swim Schools Worldwide

Happy Nappy™ Costume Hidden Treasure

This pretty costume incorporates a full reusable Happy Nappy™ for reliable faecal leak protection.

Colour: Hidden Treasure
Happy Nappy™ Costume Hidden Treasure Happy Nappy™ Costume Forest Walk Happy Nappy™ Costume Sunny Bear Happy Nappy™ Costume Up & Away Happy Nappy™ Costume Garden Delight Limited Edition Nautical Happy Nappy Costume Happy Nappy™ Costume Little Ducks Happy Nappy™ Costume Owl & Pussycat Happy Nappy™ Costume Nina's Ark Happy Nappy™ Costume Dragonfly Happy Nappy™ Costume Navy White Stripe Happy Nappy™ Costume Fallen Leaves Happy Nappy™ Costume Flower Meadow

Little Treasure Hunters will love the new hidden treasure Happy Nappy Costume. Find the diamonds and pearls amongst the fishes and seahorses in this beautiful new design.

The award-winning Happy Nappy™ costume provides the same, reliable leak protection of a Happy Nappy, in a cute swimsuit design. The integrated Happy Nappy is made from 1mm thick neoprene that moves with your baby, and its pull-on design ensures there are no gaps between poppers which would compromise the leak resistance. The comfortable ribs around the waist and thighs, fit securely to stop any solids from escaping into the pool.

The nylon/elastane swimsuit top is comfortable with wide straps that won’t leave red marks and is chlorine resistant so will remain bright and colourful wear after wear.

Available in our bestselling designs for babies from 0 to 3 years

Key Features

The only swim school approved swim nappy costume
Multi Award Winning Leak Protection Swim Nappy Costume
Incorporating a full Happy Nappy for a leak free swim.
UPF50+ Sun Protection


Economy - Free economy shipping on UK Orders over £9.99 and £2.99 for orders under £9.99, approximately 4-6 working days.

Standard - £3.99 per order, approximately 2-4 working days. Free for orders over £30.

Next Day - £4.99 per order. Free for orders over £50. Orders must be received before 2pm (Monday-Friday) for same day despatch, we can not guarantee same day despatch for orders received after 2pm. Orders received after 2pm on Friday will be delivered on Tuesday. 


Approximately 5-10 working days (Mon-Fri), price depends on destination a quote will be received at checkout. You will be required to pay local duty, taxes and a handling fee to your local carrier before delivery. 


Approximately 5-10 working days (Mon-Fri), price depends on destination a quote will be received at checkout.

See Full Delivery Information

See Full Returns Information