How do you size the Nageuret?
The Nageuret comes with snaps around the waist and some in the front called rise snaps. To adjust the size around the waist start with stretching the diaper to the tightest fit without causing deep purple (slight red marks okay as long as they aren't painful) and snap all the snaps on each size according to the size that fits best. With the rise snaps, it really depends on how you want it to fit. For the tightest fit bring the bottom row up to the top and snap all three. It should create a small crease. It makes them less baggy and more like underwear.
For more information on How to Size
Do swim diapers contain pee?
The short answer is no. Swim diapers aren't designed to contain urine. There are some on the market that might hold some if your Little goes while their swim diaper is dry, but once they get into the pool that absorbing layer is soaked with water and won't contain any urine (or any other liquids for that matter).
Why doesn't the Nageuret have an absorbing layer?
We thought about adding a removable absorbing insert, but it was too difficult to remove before going swimming. Having that extra layer holds more water next to your baby's skin, which can make them 1. Colder when you get them out. 2. Possibly cause diaper rash because, let's be honest wet fabric is kind of scratchy.
So we recommend changing your Little once you get to the pool and don't be embarrassed/surprised if they pee before getting in, Beau did all the time prior to potty-training.