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How to write children's literature
Know your target audience.
It can be easy for adults to lump all children's literature under the same umbrella, but the truth is the children's literature market is vast and diverse. At the center of all these sub-genres is the age group of your target audience.
Knowing whether you want to appeal to young adult readers or readers in elementary school may be the difference between writing a story that will become a short novel instead of a story for a picture book. Read a lot of children's literature.