A few things to add to what Robin and Princess said:
1. Baby Swap - this is where you both get to ride a ride, but only one of you has to stand in line! You and DH go to the CM that is standing at the beginning of the line (usually with a measuring stick thingy) and say you want to do a baby swap. S/He will give you directions on how that ride does the swap. Some give you a fast pass to use as soon as he gets off others have you go in the exit. S/he will also tell you where to can wait for the ride. When DH comes out, then you go in following the directions that the CM gave you. The CM's are used to people coming through the end of a ride so just mention that you are doing a baby swap. And make DH take turns waiting with the baby unless you don't mind and prefer not to stand in line! LOL!!
2. Pack your own food or stop at the grocer on the way to the resort to get food that your baby is familiar with. Don't rely on there being food for your kid to eat in the park and the jarred baby food at the baby centers is expected. You may be surprised and your baby may take to everything at the park, but it would be better to be prepared than have a fussy baby turning it's nose up at Fruit and Lychee
3. Since you are going to be there for such a long time, don't try to kill yourself to see and do everything! You've got the time. We killed ourselves once (we only had 3 days and truly did try to do and see everything Ufdah!) You will appreciate it and your baby will appreciate it.
4. If you baby likes the characters, see lots of them and take lots of pictures. CM's will even take pictures of you with your baby and the characters.
5. If your baby hates the characters, avoid them. I've seen way too many near panicky infants and toddlers being forced to pose with mom or dad's favorite character. What a horrible picture to look back on "Here is little Johnny, screaming his frightened little head off with Eeyore!"
6. If baby is willing, do some baby swapping of your own. Let dh keep the baby at the resort for a few hours while you stroll through a park or go shopping at DTD and then let him do the same one day you are there.
7. If your baby starts getting fussy during a meal, the CM's will be more than happy to pack your meal to go if you think that he would do better having a nap or out of the hussle and bussle of the crowds.
8. HAVE FUN! (And that's an order!) I loved taking my babies to WDW and they love looking at pictures of themselves as babies on different rides and with different characters.
44 more days!!!