We brought our older DD at 8 months old and it was SUCH a fun trip. Seriously best character interactions and she LOVED the rides.
She has since been about 14? times.
At 8/9 months old, DD was taking 3 naps per day (napped perfectly in the stroller on the trip) and eating 5 times which was manageable, plus she was eating table foods so that helped keep her occupied at restaurants. We brought pouches (practice at home), freeze dried fruit, yogurt melts, etc. She sipped through her first straw at Kona café and had her very first taste of ice cream at ohana <3
Oh and we did do the first haircut as well -
She was also even independent enough to sit on her own during some of the shows
Now we have a new baby, and we took her at 10 weeks old. That was a much harder trip (but stemming from some eating issues she had been having). She would not lay in her car seat in the stroller, so we had to hold her the whole time, and of course at 10 weeks old she was taking something like 5 naps/day and eating 8-9 times per day, not as regular as an older baby. We still had a ball though and made some great memories as a family.
Any other specific questions feel free to ask <3