We didn't do much different than normal when we brought Ethan home. I think it is important to keep the dog's routine fairly similar. So if there are going to be big routine changes start them now (or weeks ago). Tim brought a blanket home from the hospital, the dogs couldn't care less. I had my mom bring the baby in the house when we came home, so I could greet the dogs since I had been gone for two days. We had the dogs outside while we came in and settled, then in a quiet room we let each dog in indiviually to meet him. They all were curious, and I let them sniff him..and then they were done. Except Bella, who felt it was important to try to lick the baby fuzz off his head, and I gently stopped that.
After that, it was just business as usual. We didn't make a big deal about it, and neither did they (there were only four then). Of course we didn't leave him alone in the room with any of them just in case, but they didn't really show any interest unless he cried, then they looked at me like "are you going to DO something?"
The trouble usually starts when the baby starts toddling. Toddlers move strangely, and it is unnerving for dogs, especially when they come towards them, and reach for them YIKES!
If your dog becomes nervous in this situation you will have to do some desensitization work, and be very viligiant when they are near each other. I figure, if the dog gets scared and growls at the child before the child is old enough to understand to leave the dog alone, that is MY fault, not the dogs. I have to be the advocate for the dog, and not let the child freak him out. You don't want to reprimand a dog heavily for being scared by a child…they will become even more wary, and more likely to bite.
There are lots of basenjis that adapt to a baby in the family with no problem...try not to be so nervous that you make Jack nervous