We just got back from Disney World with our 8 month daughter. I was so worried about how things would go. All I can say is RELAX
Thats what everyone told me and everyone was right.
You will have to fold up your stroller and put it and the car seat on the x-ray belt. Check your stroller in at the desk by the terminal and you can keep your son in it until you board. You fold it up and leave it at the end of the terminal right before you actually step on the plane, and thats were it will be when you get off the plane. Oh, at check in we asked if there was an empty seat for her car seat. There was, so they assigned us to A and C seat leaving B open for her. We ended up having a seat for her both ways. Let me tell you that was WONDERFUL!!! IF you can't get him a seat then you check the car seat with the stroller. They do let you take any food you need for the baby on the plane with you. We feed our dd on the way up in the plane and she slept the rest of the way. Our flight home was late and she slept the entire way. We tried to wake her up to eat on the take off but she was to tired.
Make sure you pan for the unexpected. Our flight was canceled after we had checked in so what ever food we had for her in her diaper bag was it. We were stuck at the airport for 7 hours before the next flight. I gave her the last bit of formula on the plane so I lucked out but I will plan for the unexpected next time.
If you have a nice big stroller than I say take it. My dh and I went back and forth about which stroller to bring. I wanted the big one because it held more underneath and it lays back all the way so she could nap...that was a god send! She napped just fine in the parks while we kept moving. It was a bit of a pain to get on the busses with it at first but we got used to it and by the end of the trip it wasn't so bad.
Most of the characters will hold an infant. Some of the oversized masked ones will not. All of the "face" characters will, Mickey and Minnie will....the only ones who didn't for me were the Pooh characters, Balloo, and King Louis. We had her pictures with 50 characters so that was a lot of them that will. Most of them wanted to sit on the ground to hold her. At first I thought that was maybe the "rule" there but then I had many that didn't sit so who knows.
If you don't know about the baby centers you might want to find out about them. I think the official Disney World site might tell you about them. Cast members everywhere would stop us to tell us about it. It was wonderful how many people wanted to help. Even some of the Princesses and the Fairy Godmother asked us if we knew where it was.
You can take him on any ride without height restrictions. We took our Dd on just about everything. We used a carrier while we were in the lines. It was nice to have that because we just sat down on the ride and got off the ride and she just came along, we didn't have to worry about trying to juggle her while getting on a moving ride.
We always took a change of clothes to the parks, you never know when something might happen! I think that is a good idea. I don't know what the temperature is forecasted for your trip but bring warm clothes for him. Our forecast was high 70's and low 50's....I think it was in the high 50's-60's during the day we only say the 70's once. It was so cold. We had our dd in a fleece snowsuit during the day and her heavy snowsuit at night. The only reason we even took those was because we were going to the
MVMCP we didn't plan on going anywhere at night except that, and she ended up wearing them everyday during the day except one.
Gosh I have babbled on....Have fun, I found it relaxing to take an infant. It stopped me from running from ride to ride like I normally do. It makes the trip more laid back.
Take lots of pictures so he can enjoy them when he is older! You'll have a great time!