Re-reading is a source for expectancies.
Through the routines, the baby quickly develops expectancies for the language in each context. The expectancies help him to decode the language in greater chunks and with greater speed and understanding.
Re-Reading: This is really a combination of repetition and routine, but it is very important.
Very soon, when parents are reading regularly to their child, they will note that the child wishes to have the same book read over, and over, and over, and over and over again.
Although it is mentally punishing to the parents to do this, they should humor the child as many times as he/she wants.
The repetition sets up expectancies that enable the child to extract more and more linguistic information from the text, including not only the story line, but nuances of phonology, grammar, semantics and pragmatics.