Hi Cindyfan. We took our 2 year old when she was only 3 1/2 months. She was so good! We did the baby swap a few times for the rockier rides. It works out great. For other rides like Peter Pan, Pirates, etc... we would just hold her on our lap. I tried the whole front carrier but I didn't like it and ended up returning it when we got back home.. I don't go on any of the thrill rides like Tower of Terror, Splash Mnt., etc.. so my husband gets in line with my older kids or gets fast pass and I walk around to a gift shop or hang out and catch up with him using our walkies or cell phone. My 8 year old doesn't go on any scarey rides either so there's no difference with the new baby. I have to sit out with him sometimes too.
We're bringing a 7 or 8 week old in June.. and can't wait..we're not worried about the parks..just worried about the nightly bottle feedings that will make me sleepy!! But, if we want to go on vacation to Disney, it's what we have to deal with it. I'd rather be there than home!