Although I have a female Basenji, I'll give you my experience:
We had Natalie when Nala was 10 mos. old. Nala was our first "child" and slept in the bed with us, under the covers - as she still does. :p We even co-slept with both of our children until recently (still on occasion too). :o There was never a problem except when she became a toddler and wanted to play with Nala's round foam fleece bed. She made what we call an "ugly" noise (for which she was immediately reprimanded, "NO!") :mad:
We did something similar to what Andrea said. No real big routine change. When we brought her home, Nala came up and sniffed her and was really interested - but in a sweet way. We praised her for that, as we still do for good behavior. She wasn't well socialized with children, just around them on occasion. We were excited to introduce them to each other! I have tons of pictures of my husband and/or me on the couch resting with Natalie in our arms and Nala in between our legs. Same 4 years later with Logan. We also have pictures of Nala peeking into the bassinette on her hind legs. Of course, we never left them alone together…mostly because I rarely left her alone!;)
The only thing that I really try to do (and it's tough for Nala) is to not use her paws as "hands" to get our attention. I guess I had the presence of mind back then NOT to teach her "give me your paw" or "shake hands", because I had friends whose child was scratched in the face, near the eye. We taught Nale to "use your nose", when she want to be pet, etc.
You have to be cautious certainly, but I don't think I would expect him to be anything but curious.
IMO, it will be really difficult to not make a fuss over the baby, you (and all of your visitors) just will.:D I think you should just equally make a fuss over what a good boy Jack is too. It's just a change in the household and everyone will have to make adjustments. You and your husband should talk about it and make sure he is there with you to intervene if he tries to jump on you and the baby and scratch him. You will be recovering for a while and won't be able to jump up and fend him off, even if it is just to sit on you or whatever.
Boy, I can go on and on and on....:eek: