One of the endearing things about kids is how they butcher words.
The other day my 4yro asked if he could wash his hands.
"Why do you want to wash your hands?" I asked.
"Because they're Moy-ist." He showed me his dirty, "moist" hands and I let him go wash them.
As a children's writer, I pay a lot of attention to how kids express their ideas. Their darling word choice, and sometimes word-butchering, becomes fodder for books that other children would enjoy.
On the other hand, because children are learning from what they read it's also important that most books follow grammar rules and word meanings. Junie B. Jones is an excellent example of keeping the little girl voice, while also adhering to somewhat correct grammar.
"My name is Junie B. Jones. The B stands for Beatrice. Except I don't like Beatrice. I just like B and that's all."
-- Junie B. Jones and The Stupid, Smelly Bus
"I don't think I'm allowed to have the kind of drink named a beverage. 'cause I'm only allowed to have milk and juice and that's all."
"Mrs. looked up at the ceiling with her eyes. Then I looked up there, too. but I didn't see anything."
-- Junie B. Jones and The Sneaky Peeky Spying
What mistakes or "butchering" inspires you to create?
I write about, with, for, and around kids all day. (Well, maybe I do the dishes too. Sometimes.)