Charlie Banana - great fit, design and easy to use!
Just bought the Charlie Banana swim diaper in the Kate design for my 20 month old in size large. She weighs 11.3kg and they fit perfectly with a little room to grow, but not too big that any accidents might leak out. Whilst they aren't customizable in terms of size like the Bummis swim diaper, which I also bought in the large, they are very easy to use, put on and take off and are of a nice soft swimming costume type material that seems comfortable. I love the Kate design (am British after all!) and am very happy with the purchase. Definitely recommend them! They washed up well in the machine although I hung them to dry rather than putting them in the machine.