Your dogs will not react to your baby the same way they would to someone else's. They will smell you in your child, the maternal bond is evident, and they will know that its your offspring (putting it in a dog's prospective, not to make your child sound like a dog...lol).
The best reaction from you is to include your dogs in the things you do with your baby. I had a mature intact male Dobe when I had Andrea. I called him to come see the baby, told him it was our baby, and took him everywhere with me and Andrea. Let him come in the room and laydown by my chair while I nursed, would tell him "time to change the baby", heel command given, sit-stay, etc.
The idea is not to force the baby onto the dog, but to let the dog see that the baby is a part of you and your routine. Most times the dogs get quite taken up in the entire process. Max was a great dog, and through this process he wanted to stay by Andrea's side. In bringing the dog with you, you take the role as Alfa and you control the environment while showing your dog that there is a new pack member, one to be protected.
Problems arise when new parents pull their babies away from the dog, or pull the dog away when they go to sniff or lick the baby. Dog germs are not going to kill your new baby (I am generalizing here, as I wouldn't figure you as the type to think that way personally).
Its actually quite important to let your dog smell your baby initially so that they can link the connection. Don't be alarmed if the dog sticks his nose against your baby's face. The dog will want to smell around the ears, eyes, nose, and mouth.
So your reaction is key. If the baby cries (this is usually the one one thing that can trigger a reaction from your dog), verbalize "whats wrong with the baby" and go to the baby.
If your dogs are allowed on the couch, and you have baby in arms. It might be your kneejerk reaction to pull away, or tell the dog OFF. Try to resist that, tell the dog to be gentle and lay down. I always would say "gentle with the baby"... a term that still sticks with me today, because the dogs like the way it comes out and responds well to it.
In the next breath, it can be equally damaging to force your baby onto the dog. I cringe at half these You Tube videos I see of parents putting their babies on their dogs, laying them on their sleeping dog, etc. I don't care how good natured your dog is, that's just risky business. Let the dogs spectate and interact as much as safely possible, but give them time to accept.
My one word of advice for you is to train your dogs now to do the things you will expect of them after the baby comes home. It will be easier for your dog to adjust to a baby if the routine changes are already in place beforehand.
Because you have more then one dog, get onto the long down so that they know and respond to it perfectly. Because that is the one thing you want your dogs to do for sure, is to down with a handle signal and stay down until you release them.
Dealing with a nervy or unstable dog will be a different challenge, but not an impossible one to hurdle. Its just really important that you do not react in a way that will trigger negative reactions in that sort of dog.
Congratulations though. There's no reason to think that the dogs have to leave because you have a baby coming... they can all live together in harmony.