We took our littlest daughter at 14 months we all had a blast! She's 3 now and will be taking her 4th trip to WDW in June! There's plenty for the little ones at WDW, but first thing you'll need to do is realize that you'll have to slow down. Having multiple adults there will be a huge help, but these are the things we learned from our experiences with a toddler:
- Decent umbrella stroller is a big plus - don't know if you fly or drive, but either way I recommend having one that you can keep with you at all times, and will fold up quickly to hop on buses or trams. Doesn't have to be anything fancy - we bought one for about $40 and it will be taking it's 4th trip to WDW in June as well.
- We found that staying in a resort near the parks made things much easier. For our little one, an almost daily trip back to the resort with one of the adults for a nap was very beneficial, although there were times when she just crashed in the stroller and we kept going. Every kid is different, but you'll know their schedule and I would encourage you to follow it as much as possible. We also found that staying in a nicer resort was better (WL for us), since we were there much more than with older kids, and the transportation was quicker.
- We scheduled a day mid-trip for just resting and spending time at the pool.
- Character meals are great, but she may be intimidated by the bigger fur characters. We found that letting her watch dvd's of the characters before our trip helped, but she still took several days to warm up to them. Just be patient and introduce them slowly.
- If she likes Disney Jr, then you def need to do the Disney Jr Live show in DHS. Our daughter was able to do most every ride that she was tall enough for and loved them (even things like POC and HM, which we thought would scare her). Also recommend the shows in AK (Nemo and FOTLK).
- Depending on how she reacts to fireworks, you may want to do Wishes and/or Illuminations from a distance the first time (Wishes from the Poly beach or even the Tomorrowland Terrace; Illuminations from inside a restaurant like La Hacienda).
Just slow down and enjoy her reaction to everything and you'll have a great trip!