There are thousands of words in books that don't appear often enough in conversation for children to learn their meanings. They need to hear them used in meaningful ways many times to begin to understand what they mean. That's why rereading the same book over and over again is so valuable to young children.
Tumble Books | Homework Help
Center for Early Literacy Learning
Too Small to Fail
Reading is Fundamental
Helping Children Read and Succeed
Ohio Department of Education
PBS Kids | Sprout