When all is said and done for clubbed foot babies sometimes their feet are different sizes. My son's are about a 1/2 size off from each other, but we just wear the same size. I know some children have a bigger difference and need buy two pairs of the same shoes to get the right sizes or find places that will let you order different sizes. I found these places can help parents like those of us with different foot sizes by providing mix matched shoes.
Hope these help some of you too.