The teaser images show stars Jennifer Lopez, Elizabeth Banks, Cameron Diaz, Brooklyn Decker and Anna Kendrick all pregnant with assorted different taglines.
Lopez's Holly proclaims that she "can't wait" to meet her baby, while Diaz's Jules says: "If I knew I'd have a rack like this, I would've gotten knocked up years ago."
What to Expect When You're Expecting's cast also features Chace Crawford, Matthew Morrison, Joe Manganiello, Megan Mullally, Dennis Quaid and Cheryl Cole in a cameo role as a talent show judge.
> Cameron Diaz, Jennifer Lopez in 'What to Expect' first trailer: Video
View the What to Expect When You're Expecting poster gallery below: