The way my paper works, is that
Monday, Tuesday, Wednesday, Friday, Saturday, and
Sunday they have a baby announcements supplement, where the names are just first names (so if there's two names listed, it's a double-first name). Thursday is the official birth announcement day, which means there may be names that were printed from the rest of the week, but now with middle names, and new announcements ones. On Thursday's, they also list the parents. During the other days, they only list the hospitals and/or midwife.
I have noticed the nicknames a lot, too, but I don't agree with your "outdated" comment. What's outdated to you is fresh to others.