E.B.
I've never had this experience, so I'm not writing from experience, but I am writing to respond to those who say she should include both babies on birth announcements. When I have sent birth announcements, I often send them to people I am not in very regular contact with--people who might or might not have known I was even pregnant. If she does not acknowledge the passing of one daughter, she may wind up fielding questions and congratulations that are more painful than comforting. If she doesn't want to do a more wordy acknowledgment of the daughter that died, perhaps she could simply do a birth and death date on the announcement. On the other hand, I think it's perfectly appropriate, if she wants, to simply send out a birth announcement for one baby. Friends she doesn't know well will simply know she's added a daughter to her family; friends who are closer will know something is up, as she had been expecting twins, and friends who know her well probably already know the situation and can lend her support. I would say it depends greatly on her emotional state. I'm so sorry for her loss.