I am always amused when people think that it is easier to write for children than adults. Fewer words and pages, and they are kids, they like anything, right.
Wrong, wrong, wrong.
The above link leads to an op ed piece that is great, and speaks to why some adult authors fail abysmally at writing for children and teens, and why some writers succeed.
I think it is worth noting, when you write for children and teens as if they have a brain, a moral compass, and when you are a great writer, the readers will come.