The idea is that there is an everlasting equivalent for rhyme in children's books: well-written text. That is much simpler to say than it is to do, but it is the truth. You don't require rhyme if you utilize charming wordcraft to construct a great tale. The fact is that most children's books do use some form of rhyme. This includes poems, songs, chants, etc. Even stories told without any formal words (such as fairy tales) usually include references to things like "once upon a time" or other phrases that are easy to sing along with. It is true that not all children's books need to rhyme. Some authors choose not to use any form of repetition or variation in their writing, which makes it difficult to create a song or poem out of them. However, this does not mean that they write bad books - it means that they write different books. There are many factors that go into deciding what type of writing will work best for a story, including character development, setting description, and theme exploration. None of these factors requires rhyme to be effective. As long as children's books contain enough repetition to keep readers engaged, then they can include any form of writing we wish. The only requirement is that the writing must be clear and understandable so that kids can follow the story.