Definitely whatever you are comfortable with for sure ~ I have always gotten something for the 'baby' from myself and the daycare kids AFTER baby arrives and we know the sex for sure and we make up a group 'card' for the family.

Before baby arrives depending on my relationship with the client (aka how long have they been with me, how actively involved are they in the program, our rapport I will get mom a little 'pedicure' gift certificate or something cause I have been told it is nice when you are 9 months pregnant and about to have a bunch of people looking at your feet in stir ups it is nice to have pretty toes and it is hard to reach them yourself .... one mom was complaining about how hard it was getting to 'trim the hedges' as her pregnancy went on (summer baby) so her I got a waxing gift card to show I had been listening but we had that kind of rapport to pull something that personal off