Routine is a source for expectancies.
Routines: Very close to repetition is a routine. Babies, of course, being new at the life game have few if any expectancies to help them decode the world about them.
But we can quickly develop some through the development of some daily routines. For example, there can be morning getting up routines or night going to bed routines (almost rituals), eating meals routines, taking a bath routine, going for a walk routines, etc., etc.
In all these routines, the same language is used. It does not have to be exactly repeated verbatim each time, but there is a general similarity.
For example, at bath time we always talk about the same objects (the yellow rubber ducky, the bubble soap, the tug boat, the wash cloth etc.); and the same actions (taking off clothes, turning on the water and getting into the tub, putting in the baby soap etc.