I have a children's book that I'd like to post, but can't find the help docs that mention them.  I know I've seen them before.  Can someone help?

I believe that children's books have the same posting guidelines as any other books. I have never seen specific guidelines for children's books.

   That is correct, childrens books have the same rules as normal books.

The only time a children's book would have a different rule was if it had included items (batteries, non-media, etc.).  Other than that you're good.  I post almost nothing but children's/teen books.  :)