@Kristen Hanchey Cosgrove, this is adorable. You could do it for Ryon. You'd have to change it from flowers, but something like this could work! :) Oh oh! You could take a belly pic with a hat on top, then let him wear the hat in a pic once he's born! :)
Having empty chairs across from the bride and groom is a Scandinavian tradition. The signs aren't necessary, guest just know that they are invited to come and chat. This is a simple way to take the pressure off of the bride and groom to do a receiving line or make it around to every table to greet everyone. This way the newlyweds can actually sit and enjoy the meal and it's up to the guests to say hello.
Mamas and their babies... how cute is that.