If you intend to write children’s books that’ll be adopted by schools, you might want to look into getting one or more of the grade-level measurements that educators use. One that seems to have a lot of support is called Lexile. Many children’s books on Amazon come with a “Lexile Measure” next to the “Grade Level.”
Writers who’d like to get a certified Lexile measure for their books can find the details here:
The usual price per title for tradebooks under 150 pages is $30, which isn’t bad if you intend to market the book to educators who like that sort of thing. You can find a long list of publishers who use the service here:
If you’d just like to get an idea of what level you’re writing for, try one of the free online sites such as:
The results will vary. What I wrote above gets grade levels varying from almost the fifth to the early eighth grade.
Good luck with your book!
–Mike Perry, co-author of Lily’s Ride (YA novel set in 1870s North Carolina)