Life Events let users denote major happenings on their Facebook profile pages. For example, users can announce when they have moved, gotten a new job, picked up a new hobby or had a baby.
Until now, there has been no way to announce a pregnancy other than to create a generic Life Event. A new expecting a baby category lets Facebook users specify a gender (if known) and a due date, along with the usual categories for people involved, location, photos and the story of how it happened. (For pregnancies, that last category should perhaps be left blank.)
Pregnancy announcements will show up on users’ Timeline pages, and they’ll also appear under Celebrations on users’ home pages, along with birthdays and other joyous news.
Just keep in mind standard Facebook logic: Don’t share anything on the network that you wouldn’t want the entire world to know about.