When you decide to write for children, there are some other things you need to think about. What kind of book will I write? Will it be a picture book? An early chapter book? A YA? Or maybe something in between. Here is a bit of an outline that will hopefully give you the general idea of where your story might work:
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The Picture Book category is called such because the illustrations play a significant role in telling the story.
Baby books and
Toddler books are usually lullabies, nursery rhymes, fingerplays, or wordless books. The length and format varies with the content. For babies and toddlers the books are short, simple stories and usually range from 0-300 words
Picture books - typically picture story books are 32-page books for ages 4-8. Some publishers say ages 3-7 or even 5-9. It depends on the publisher. Word count is usually somewhere up to 1500 words, with 800-1000 words being the average length. Plots are not complicated and they have one main character who assumes the child's emotions, concerns and viewpoint. The illustrations and story share a 50/50 role. Usually the pictures are on every page or every other. Sometimes a picture book will exceed 1500 words; this is usually geared toward the upper end of the age groups and is the longer ones are often non-fiction. Nonfiction in the picture book format can go up to age 10, 48 pages in length, or up to about 2000 words of text. Early picture books are geared toward the lower end of the 4-8 age range and are simple stories under 1000 words.
Easy readers are for children just starting to read on their own (age 6-8). The books usually have color illustrations on every page like a picture book, but the format is more a little more mature and sometimes are broken into short chapters. They can be 32-64 pages long, with 200-1500 words of text, occasionally goi

ng up to 2000 words. The stories are told mainly through action and dialogue with one idea per sentence.
Books average 2-5 sentences per page.
Transition books or
Early Chapter Books for ages 6-9 bridge the gap between easy readers and chapter books. They have the same style as easy readers but are longer - sometimes about 30 pages long with 2-3 page chapters.
Chapter books for ages 7-10 are 45-60 pages long and broken into 3-4 page chapters. Stories have a more intricate plot than transition books, though they still can contain a lot of action. The sentences can be longer but paragraphs are still short with 2-4 sentences being the average. Chapters often end in the middle of a scene to keep the reader turning the pages.
Middle Grade Books have the greatest readership. This age 8-12 age group is considered to be the golden age of reading. Stories are longer (100-150 pages,)and more complex with sub-plots involving secondary characters. The themes are more sophisticated. Readers at this stage and age enjoy good characters that they can relate to; they get hooked and want to read more. Series books are popular in this age group. Fiction genres range from contemporary to historical to science fiction/fantasy; nonfiction includes biographies, science, history and multicultural topics.
Young Adult for ages 12 and up, are longer stories, about 130 to 200 pages long. Plots can be complex with several major characters, though one character should emerge as the focus of the book. What do teens struggle with today? That's what YA novels need to encompass.