Argh, just lost my whole message.
Itslittlek, I can only offer my own experience with dogs and babies, and for me it has been the best thing. As far as jealousy goes, it's just down to making sure the dog doesn't feel that the new addition has adversely impacted their life. If you get one in September they should easily be 7 months by the time baby gets here, so luckily past any mouthing phase, house training, and will have a full set of puppy behaviour classes under its belt. For us, our dog Wispa loves our DD and always has done, but we did make a point of introducing them as soon as we were home, not keeping Wispa contained in another room at any point, making sure we still played with her every day even if for just a couple minutes, and still went on walks as much as possible. And there WERE days it just wasn't possible, but she was never relegated to a lesser position in the family so she has never felt jealous. If anything I think she was grateful for the extra face to lick 