I'm not so helpful with what resort to stay at (we've only stayed off-property with a baby), but don't stress about the Theme Park area...WDW is wonderful, (I can't imagine how nice it would be to be near by!!) We took my DD when she was 10 month-old (a little older, but still very much a baby), and she loved it!!! The nursing/changing facilities are WONDERFUL!!, and they are a great place to relax in the middle of the day if your other family members do not want to go "home". All parks have facilities with private rooms where you can nurse your baby...and, if you do not nurse them, you can sit in the rocking chair and rock them (and, take a little nap yourself

). I would do this while the rest of my party was waiting for the parade to start (they would get a spot near the changing/nursing facilities). Between the time that my family was "saving" a good parade spot, and actually watching the parade, my DD and I would get a really nice nap in!!! Of course, we didn't do this everytime as I wanted her to see some parades, but since most go on twice a day, we would just opt for the later (usually less crowded one).
I really hesitate to tell you this, because what happened to my DD was a fluke, but she did end up in an Orlando hospital (well, actually two hospitals). This was Nov. 2002, and it was all over the news about the "Norwalk" virus being on Disney's cruise ships. Well, we figured we weren't going on Disney's cruise ships, so we thought we were fine. I did not stop to think about all of the people who do a 3-day cruise, and then go into WDW. Well, on day 4 of our 7-day vacation, my DD began throwing up. I took her to a minor emergency center, and they refused to treat her, and told me to take her straight to the hospital. It was SOO crowded, that they were treating people with IV's in the lobby!!! We stayed there all night, and the Dr's finally got her a bed in a pediatric hospital 30 miles away. Since they were "sister" hospitals, she could be admitted into one and "transferred" into the other, but we were told NOT to release her from "hospital #1" and take her to the ped. hosp, because her bed would be gone by the time we arrived (locals were getting sick from this virus, too). So, she got transferred in an ambulance (another freaky occurrence!!). Anyway, I got the virus, as did my DH, and when we returned home, my Mom came to visit (and make sure my DD was okay), and Mom got the virus!! It was VERY contagious, and very virulent!!!
Anyway...I truly to NOT want to scare you...things like that just happen sometimes no matter where we are, or what we are doing!! My DD got a virus locally 4 months later, and once again ended up BACK in the hospital!!! My point for telling you this was:
1) Listen to news reports...if there is anything "contagious" on cruise ships or in the Orlando area...think about not going...I never stopped to realize how fast that "junk" spreads via the park!!
2) Get a rental car!!! We learned that with kids we will NEVER go without a rental car again...even if we are staying on property. We would've been in SO much trouble if we had not had one!! I now depend on knowing I can take my family anywhere, at anytime. Besides, with the number of people you are taking, it is really not that much more expensive than a shuttle or town car.
Anyway, I do NOT mean to scare you...I would take a baby again in a heartbeat...and, hopefully will find myself in that situation again very soon

!! Their facilities are wonderful...and, that is BEFORE I even talk about how accomodating they are with the "baby swap"!!! If the rest of the world was as "nicely designed" for Mom's as WDW...being a parent would be a breeze!!
Have a WONDERFUL time...and, congrats on your baby!!
Beca