What exactly makes something a "children’s siddur?"

For a while now, I’ve been using a siddur called “Siddur Chinuch – Chaim Shlomo” (published by Artscroll). I like it because the type is large enough that (most of the time) I don’t need my glasses to read it.

However, I glanced at the preface today and, to my shock, the preface says “The publication of this new Siddur for young children is a source of rare satisfaction…it is especially gratifying, therefore, for us to publish this new Siddur Chaim Shlomo for the benefit of our youngest children.” Having read the rest of the preface, there’s nothing that tells you what distinguishes this from a regular siddur.

I’ve been using it for a little over a year now for regular davening, and it seems to have everything I would normally need. Any idea what would make this a children’s siddur?