Children's Books have a Logic All Their Own
I've been reading the work of several aspiring children's book authors and one of the consistent problems they seem to struggle with is logic in their storytelling or the lack thereof.
The rationale they offer, particularly when they are writing for very young readers, is that these are children's books and are all about imagination. Yes, imagination is important, even essential, but no matter how fanciful or fantastic the imaginary world becomes, it must also be believable and operate logically within its own clearly defined borders.
For more on this topic, you won't want to miss the April 12th post: Don't Ignore Logic When Writing Fiction for Children at Write4Kids.