I currently use Tesco own swim nappies having used Tesco own regular nappies since my son was born and have been very happpy with them. I assumed the swim nappies were working ok until recently when I forgot to take a regular nappy along with me and put him in a swim nappy on him to come home. He was only in it for about 45 mins and when I went to change him he was absolutely soaked! Therefore I am now wondering how they work and are they leaking wee into the pool? I have noticed when I take the swim nappy off him after swimming a lot of water spills out of the nappy, is that wee?