This practical swimming under nappy can easily adjust into small, medium, and large sizes in a snap of a popper, to grow with your baby. Designed to be used as part of the Happy Nappy Double Layer System for swimming lessons, it will fit neatly and securely under the Happy Nappy for extra protection against leaks in the pool.

The Size Adjustable Under Nappy can also be worn on its own and is an eco-friendly alternative to disposable swim nappies. Designed to be long-lasting to fit for over a year, simply use the next row of poppers to provide extra room in the nappy when your baby grows.