(I think these are highly entertaining even to the childless population, not trauma-inducing. If I'm wrong about that, I sincerely apologize.)
The crew on Whose Line Is it Anyway? - Colin Mochrie, Ryan Stiles, Wayne Brady, and rotating guest Chip Esten (with Drew Carey as the host) - does a number of fun improv stunts, but "Greatest Hits" is my favorite. (It's so hard to choose, though!) Some enterprising people have put volumes of WLIIA on YouTube, for which society owes them a debt of gratitude, because in my opinion this is one of the top five funniest shows that has ever been on television, and certainly better than Friends (which it aired opposite, finally causing it to go off the air).
Anyway, here is a magnificent pregnancy-related spot (I swear there are more pregnancy songs, but right now I can't find them):