Congratulations on the upcoming baby. When is the big event?

I know the old wives' tale is that a cat will try to suck the breath out of a baby because of jealousy, but I honestly think that a cat lays with the baby for the warmth and bonding. It is still a danger, though, because of the fact a newborn baby cannot move around and get away from the cat that is laying too close. Please, do not let the cat sleep in the same room with the baby until the child is much older!!!
When the baby comes home from the hospital I would let the cat smell the baby and see that the baby is a non-threat to his enviroment. It won't happen automatically, as any cat does not like anything new in its territory. (I have even noticed that when one of my cats has been to the vet, the other will hiss at it because it smells like the vet office when it first comes back.)
But as long as you "involve" the cat with the baby by letting it always smell the baby and be around it (supervised!), there shouldn't be a problem with jealousy.