Hi Susie,
Although I've already finished my children's manuscript I genuinely appreciate this thread I've gained some much needed input from the posts here. Thanks everybody.
I attended a panel discussion of locally published writers where I learned that one of the best resources for feedback on a children's story is a librarian.
After receiving that information I got up the nerve to ask the head librarian of the children's section at our main library to read my story. She was fabulous. It took a little while for her to get back to me, but it was worth the wait.
She commented on age, vocabulary, length, etc. She was phenomenal.
Since that time I've made approximately 8 or 10 revisions (smile), the story is longer and I've settled on an age group--(6-9).
I also took a look at "Writing Children's Books for Dummies."
Best wishes in your efforts.