My granddaughter has wide feet, and the two pair of NB sneakers I have purchased so far for her have fit exceptionally well.  It isn't easy to find attractive wide sneakers for toddlers.  I was happy to find an American manufacturer who has an excellent selection of XW sizes for her.
Her previous medium width sneakers from another brand made blisters on her feet because they were not proportioned correctly for her.  If your young child has wide or thick feet, don't hesitate to invest in these.