It's recorded sometimes even pool policy to double up on nappies. We use a reusable swim nappy with a happy nappy over the top and then swimming outfit over the top. Just make sure use a real nappy in the car/pram etc as they don't hold wee in
I just use a reusable nappy from Primark and then costume. They are older now they don’t poop all the time so I thought the disposables were just a waste. She’s too distracted to start pooping in the pool anyway. If we went on holiday and were spending all day by the pool I would probably get disposables for ease xx
The double nappy system is to basically stop poop getting in the pool so you need either a reusable or disposable swim nappy (we always used reusable ones) and then a cover over the top to stop and leaking - happy nappy is the main one but there are other brands about. And yes unless the wetsuit has a nappy as part of it they should wear both underneath a suit.
We have disposable nappies as my son has weekly lessons, I should really buy a swim nappy cover. Our pools rules are that babies double up on the swim nappy so he wears 2 x