If you feel strongly about it being after, have you ever been to one before the baby was born? Do you know the reasons why?
Edit: I've only been to ones before the baby was born. Today a couple of coworkers were talking about baby showers and how it is stupid to hold it before the baby comes. There might be complications and the baby may not be born was their reasoning. They were really passionate about it so I was wondering if that thinking was widespread or not.