Back in Dec we took our then 9 month old on every ride we could. (that means not the roller costers or AA.) She loved them all, really like DUMBO and those like it. Her favorite was TTA. I think she just likes moving and seeing things go by. Small World gets a lot of flack, but when you have a baby it is a great ride and you an see and enjoy it from a whole new point of view. (wow, look at all those kids just my size!!!) Anything in Fantasy land is good, but gets busy fast.
Beware of rides where the bar comes down automaticly, (HM, peter pan) don't have the baby on your lap!!!
She liked the rides more then the shows or parades. She didn't like waiting for them. Oh, muppet show 3 D was way to loud for her and she cried the whole time. ALOT of things blow up in it. We thought se would like it because she loves the Muppets, but no.
We used a over the hip sling a few times, it was good. However the best thing we had the whole trip was a stoller that also turned into a back pack. It is by Instep and sells for around $50. When the parks got too full to maneuver around we just straped her on my husbands back and walked out. It worked great during a parade!!!!!!
Have a great trip!