I always travel with a first aid kit for DD with: Tylenol, Motrin, the syringe dispensers for each, thermometer, nail clippers, Vapor Rub, Aquaphor ointment, Neosporin & band-aids.
For the 2 month old, you may want to consider bringing your own sheet for the pack & play. Housekeeping will provide you with bedding, but your little one may sleep better if the sheet smells like home.
Any comfort items like pacifiers, blankets, etc. (always bring more than one!)
Hats & sunscreen for both little ones...even in February that FL sun can do a number on eyes & skin!
Your rain cover for the stroller, to protect it while you're inside. Some sort of identifying object, like a big name tag or a brightly colored scarf tied around the handle, will help it stand out. (The cover is also great for blocking the wind on breezy days, cool evenings.)
I'd recommend bringing a front pack carrier, sling, etc. for the 2 month old. It'll help with standing in line, and leave your hands free to steady yourself while getting on/off rides.
If your 14 month old has a particular snack that's a MUST HAVE every day, I'd bring a supply of it. I've found sturdy Tupperware containers protect even soft items like cereal bars really well in the suitcase.
Have a great trip, it's always a blast to see WDW anew through the eyes of little ones!
