Here's why:
* Length: Chapter books are usually designed for readers who are developing their reading skills. They need a good amount of text to engage with and practice. Three chapters might be too short to tell a satisfying story.
* Pacing: Chapters help break up the story and provide natural stopping points for the reader. Three chapters might feel rushed or abrupt.
* Genre: The typical chapter book is aimed at younger readers (around 6-8 years old). The story structure for this age group usually involves a bit more complexity than a 3-chapter book would allow.
However, there are exceptions!
* Picture Books with Chapters: Some picture books, meant for slightly older readers, may be divided into chapters for the sake of organization.
* Short Stories: A collection of short stories could be published as a chapter book, even if each story is only a few pages long.
* Experimentation: Some authors may experiment with shorter chapter books, especially if they are focusing on a specific theme or concept.
Ultimately, the length of a chapter book depends on the author's vision and the intended audience. While three chapters might work in some cases, it's not the standard format.