Yeah, they make women look really stupid. I also don't like the idea of congratulating and rewarding people for polluting the planet with more humans. There are plenty of ways to earn my respect and admiration, but breeding is not one of them.
I have miraculously (thankfully) never been invited to a baby shower. I have, unfortunately been asked on multiple occasions to contribute gift money or at least sign a card for an about-to-sprog co-worker, which I find offensive, and totally inappropriate for the work environment.