These Tsukihoshis do not run big, at least the blue one.  I ordered an 11.5 for my daughter who measures right at a 12 and they were truly too small.  (First pair of Tsukihoshis that didn't run big).  I actually ordered the 12.5 because I want a little room to grow. But the 12 did fit exactly. (I had tried on at a store but they didn't have the 12.5 so I came back to Amazon.).  They still have the typical wide-ness (making the shoe super comfy) and the tongue that is half attached so it is easy for child to put on.  The insole is removable for cleaning & sizing etc...  My girl who loves pink and glitter but wants to move on to older colors (such a tough transistion) adored the blue and rainbow color combo.