We're taking DD soon for her first birthday. Here's a little of what I have gleaned from various sources...
Our main stroller at home is a BOB Revolution. I found a Maclaren Volo at a great price on EBay to be our travel stroller. It doesn't recline, but it's much smaller and will be way more convenient for the plane, buses, etc. I've been using it a good bit lately so that DD will be used to it.
DD doesn't want to transition to sippies just yet (I've tried!) so we're going to wait until after the trip so she has what is comfortable and familar to her. We normally use Dr Brown's bottles, but I am thinking of getting some drop ins bottles so we have less to clean.
I am going to the dollar store to find some new toys to have for the flights or any other time I might need an ace in the hole.
Snacks! Snacks!
We're taking disposable bibs and table covers. My parents will be driving to the World so on their last visit to my house, I sent them home with a couple of bags of baby stuff (diapers, wipes, antibacterial wipes, bibs, etc.) If they hadn't been carrying that for us, I would have either shipped it to myself or ordered it from
Amazon for delivery to the resort.
Everyone says the baby care centers are a great place for a break.
Enjoy the slower pace of this trip.
Lots of pictures!
I got a couple of the cup/toy leashes at Walgreens for $3 or so.
Some people say to leave the parks for an afternoon break but with a 12 mo old, he may nap in the stroller enough that you can just take some relaxing breaks at the park.
We normally have ADRs for each day but this time we have one at 1900 Park Fare, one at Rose and Crown and the birthday brunch at Chef Mickey's. We're going as a part of a larger group, so if DD, DH, and I make it to the character meals and eat quick service the rest of the time, I am happy.
We are DVC members, so I am going to feed DD a good breakfast and probably dinner in the villa.
That's all for now. I am very excited about my trip (can you tell?!?!)

I hope you have a wonderful time taking your little one to WDW too!!!!