I'm tryng to get our crocs purchased for Diseny. I got my 3 year old his Mickey ones in a size 10/11. Now my 8 year old is a size 1 shoe. I look at the croc size chart at the official site and it goes from kids 12/13 to M/1 W/3. Is this the size I'm supposed to get?? I remember having this same trouble with my 11 year old when we were getting his last year. I had to take him to a store to try them on. I'd rather buy them online. Should I get the M/1 W/3 size for him??