There are books and articles about this, OP, but my DH is allergic to dogs, so we don't have one and I don't remember where I read what to do.
I do remember that you *don't* start doing things that shut your dog out after the baby comes, as that will intensify jealousy and/or need to assert his hierarchy in the pack. So if Fido will not be allowed in the nursery after baby comes, start making that room off-limits now. Stuff like that.
Maybe Cesar ___, that Dog Whisperer has some tips on this. He has some episodes on DVD etc.