We just got back from almost two weeks at WDW with an 11-month old. Here are my tips:
1. We rented a fullsize crib from A Baby's Best Friend. Our daughter slept well and was comfortable. We also rented a baby bathtub and a play yard. The play yard was really nice because we were able to place her there for a few minutes at a time and know that she was safe. She would happily play in the play yard for a good 15 minutes every morning and evening - when we were getting dressed and ready to go, for instance.
Oh, and we got a bucket of toys for her as well. She was enthralled with the toys because they were almost all "new" to her. Renting all four pieces of equipment for 12 nights was expensive (about $300), but I would do it again. All items were clean, and the company does exactly what they say they will.
2. We ordered groceries from Garden Grocer, including jarred baby food that would have been very heavy to travel with. We loved dealing with this company as well. They were polite, delivered our order to our room, and even helped us unload the order! In addition to the baby food, we got YoBaby yogurt, tons of bottled water, diapers, wipes, and breakfast items.
I know we paid a premium for these items, but not having to shop at a strange store after a long travel day was well worth it!! Time is money at WDW, and I would happily do this again too. Actually, the premium they charge (including the $10 delivery fee) is really pretty reasonable.
3. We kept the diaper bag stocked with disposable bibs and disposable spoons. I don't normally use them, but it was a great convenience on vacation.
4. We remembered the bottle drying rack, but forgot a bottle brush and had to buy a toothbrush to improvise! Remember both of them - plus some soap. We ordered a small bottle of dish soap from Garden Grocer.
5. Don't forget to inspect your room when you first enter - before letting the baby loose. Crawl around on your hands and knees, and pay special attention to the corners and under the beds/furniture. Our hotel room was quite clean, but I still found a popcorn kernel and a bobby pin that could have been dangerous to our daughter.
Hope this helps! Have a great trip and enjoy your little ones!
Disneyfriend