Something kinda odd happened yesterday at the bowling alley.. I was wondering if anyone could help figure this out..

My DD is 7 and wears a size 2 shoe.
DS is 5 and wears a size 1.

Anyway, at the bowling alley yesterday I asked for shoes in these sizes. They handed me a girls 2 and a girls 2.5. I was confused. They said that a boys 1 is the same as a girls 2.5. (So now they had given me a bigger shoe for the kid with the smaller foot.)

I know when they get bigger that the sizes change, but when? At some point will the boys size jump dramatically? Right now they both wear Stride Rites and I know his size 1 is smaller than her size 2.

Am I confused.. or is the bowling guy nuts?

Thanks...