This is also an excellent question to post in the cat forum:
http://www.medhelp.org/forums/show/3?camp=msc
We have yet to find out what life will be like with a cat and newborn. We found our cat at the backdoor months ago. He was a stray with fleas and a broken leg. He's now our crazy cat who tears through the house and acts like a child himself!
This cat seriously cracks me up. He likes to curl up in the doll stroller and push it around the house. He loves to carry my girls' toys around the house and he does scratch them.
I don't believe in declawing and most vets won't do them anymore as it is considered an amputation. However, if you can keep baby and cat separated when baby is not supervised (i.e. while they are sleeping) and your cat is laid-back enough--- then baby and cat might be best of friends and be lifelong companions.
Even though our cat scratches (only playfully every now and then or when they antagonize him) our kids LOVE him. When we're gone all day at the store, their first words when we pull in the driveway are, "HI BECKETT! We missed you Beckett!"
On another side of the coin- don't feel pressure from hubby to get a cat. Ask him to wait until baby is at least a year old or something (maybe get them a cat for their first birthday, toooooooo cute!). It is better to get a cat from a shelter that is at least 1 year old and is litter trained. You're saving a life from euthanasia and you'll be able to see their personality and demeanor!