What you'd expect when you're expecting?

NORM

Standard behavior or outcome fits neatly in this four-letter space.

This clue plays on the phrase "when you're expecting," which usually means pregnant—but here, it’s a clever twist. The word "expecting" is used in the sense of anticipation, so "what you'd expect" is simply the "norm," or the standard outcome. The humor comes from subverting the pregnancy reference with a straightforward definition of "norm." It’s a pun that relies on interpreting "expecting" in two different ways.