There are several well-known pieces with narration aimed and a youthful audience. Do a title search on any of the titles below to find recordings and/or scores of each work.
Young person's guide to the orchestra
Histoire de Babar, le petit éléphant [The Story of Babar, the Little Elephant]
Petia i volk [Peter and the Wolf]
Carnaval des animaux [Carnival of the Animals]
In the online catalog, do a subject search on one of the following terms, then click the "Limit & Sort Search" button and limit by material type to "Spoken Word Recording":
Children's films -- Excerpts
The Curriculum Resource Center also has children's audiobooks that you can borrow. To find these:
Do a keyword search on "audiobooks"
Limit by location to the Curriculum Resource Center
Limit by material to Spoken Word Recording.