Don't read or write trip reports either but we did take our youngest to WDW when she was 2 months old so the grandparents could meet their newest GD. It was too cold for them to fly up. Too cold for me too but that is besides the point.
Are you flying? Then the main suggestion I have is don't try and pack it all. Bring the basics for a day, take magic express and have the necessities like diapers, formula - if you are using it, baby food - if you have started all shipped to your hotel. Conceirge will hold it until you check in. Garden grocer is who I used but diapers.com and plenty of places will ship. Don't forget a case of water for you and hubby. Map out now where the baby stations are at the parks. If you forget to pack something in the diaper bag, they will probably have it - maybe not the brand you use. Baby swap is great. As far as day to day, be flexible and try and keep the routine! While at the parks DH and I try and have magical moments by shopping while the girls are napping in the stroller or share our favorite snack. Our girls are 2 and 3, have been 4 times with them. We have our daily park plan that we would like to do but still keep things flexible and work around THE NAP. Character meals have been the most fun for DH and I simply because of the pictures!! I have autograph books from each trip and put a little picture next to the signature, like a little scrapbook. I could look at those all day long! For us, still, it is all about preserving the memories so when they get older they can appreciate when they were 5 months old and got Mickey's autograph and picture! My 3 year old LOVES seeing the pics and videos.
I don't know how much of a Disney maniac you are, like us, but what I did and had a lot of fun at it was not only the autograph books. We got the photopass cd, pre-pay it is cheaper, stopped every photographer you come across and take pics! Take pics with the characters, stand in line or character meals. I did lanyards for each girl with Disney pins that had their month (like birthstone), year of birth, first park, first ride, my first trip. The color of the lanyard is the same as their birthstone. The bottom of the lanyard, can't remember the name of the thing that clip on but that is the year in metal. I collected everything that had Disney and their year of birth.
Creative DISigns board has a bunch of VERY cute DISigns that you can make tshirts that say this is my first trip to WDW. The DISigners will personalize their DISign for you. Just ask them. Natalie (Donatalie) has SUPER cute baby mickey and pals stroller tags. You can get lost FOR DAYS in that forum! Of course, stop by guest relations AT EACH PARK and get the button that says my first time at Disney (something like that, BOY! mommy brain is kicking in today!
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Sorry to write so much. Can you tell my girls are napping! If you are flying, I can give you all kind of tips. Feel free to PM me or ask it here. I can only tell you what worked for us, then you take it from there. Enjoy your trip! It is truly magical to see WDW thru your childs eyes!!
Oh, and congrats!
They originally game me their permission only to complain about it later so I just deleted it.
I know that reading others trip reports often helps me out. So, I will offer mine up in hopes that it might help you. 
but it is a trip report that 'stars' a baby (my then 8 month old son). 
