Congraduations!!!!!!!! I hope all goes well. Keep in mind that you might need some extra time to recover. God willing all will go acourding to plan, but even all going well, labor and delivery can make you feel like you were run over by a mac truck!!!!!!! They aren't kidding when they say you need at least 6 weeks to recover.
Can you go a little bit later? My daughter was born March 29 2001 and we took her on a car trip from Michigan to Virginia Beach when she was 12 weeks old. She did really well and it was a good time to take her. She was still really easy to care for, nursing so we didn't need to bring any food and was "settled in." However she didn't get too much enjoyment out of any off it. (but she got a lot of complaments!!!)
It also really depends on this babies temprament. He or she could be the kind of baby that goes every where with out a problem. Or the type that only needs someone strange to look at them once and it takes 2 hours to calm them down!!!!!!
We brought her to WDW this past December 2001 and she was almost 9 months old at the time. She had a great time and so did we.
To bad the next time we go isn't until March 2003, she will be amost 2 by then, I hope we surive the trip, the phrase "terrible 2, sends fear to my heart!!!!"
Have a good trip!!!!