I think it is a great idea. To market you could talk with labor classes that the women go to to prep for their births and either talk with the teachers and see if you can go to one of the meetings for a 5 minute introduction or see if you can have paperwork put into their packets they take home as well as leaving flyers for them. How about working out a deal with someone that does yard storks in your area to put information in the packet they leave behind (I am one of those yard stork people and I would do it as an exchange thing-- you put my card out and I would put yours)
Good luck to you!!:D