Maybe you should try keeping your cats away from the baby for the first few weeks – but still involve them in things, and give them as much attention as you can spare (you're probably going to be very busy!!!).
Congratulations on the pregnancy too – little boy or girl, do you know?
My cousin had a baby late last year (can't believe it was that long ago) and they've got a sheep dog called Molly – she's amazing with the baby! He's walking around now, and she's always there to pick him up, make sure he's not hurt. If she thinks he's in distress, she starts barking for someone to come.