I asked this question a but ago locally and got varied answers. Do what you feel is right. :)
Watermelon15 is right every birth should be celebrated, just gotta find the type of party your comfortable with.
I love the way she put it! ^ definitely agree!
My thoughts are, if someone doesn't like it they don't have to come. My friend had 3 boys, she didn't need anything but a few outfits since they were in different seasons. But we still had showers for her. Not for big gifts or anything, just to celebrate. It's exciting having another baby, talking birth stories,names, just getting together. She only registered for her first boy and her last child (a girl). You either brought something or you didn't. Just because you are already a mom or already have a boy doesn't mean you don't get a day to celebrate this new life.
I was a little uncomfortable with the idea of a sprinkle party, so I did a welcome home party. And had it more like a met and greet for our son, but he was also our second son (now expecting a 3rd son) so we didn't need anything. People still brought gifts.
I had a girl first time and having a boy this time. Since I am having a different gender people are planning a new baby shower for me :)
I think if it's opposite genders then is appropriate to do a shower. If you feel more comfortable calling it a sprinkle that's fine too.