We used this for our 8 month old son in Mexico, mostly in the pool and with a sunsuit over it. It fit him well and we never had any accidents in the pool. It was easy to wash and it dried quickly. We saved a bundle on disposable swim diapers by using this, but I am not sure if indoor swimming pools in Sweden (where we live) will allow them. I think it is safest to use this in a lake/ocean and to make sure your baby has done his "business" before putting it on, which is what we did to help prevent accidents.