We took our ds for the first time when he was 13 months and he did have a few crying fits while on rides - once at the end of PotC, the boats were "stacking up" (probably due to loading/unloading issues) and ds had just decided he'd had enough and wanted off. We also got delayed in HM once, which he wasn't happy about. He definitely doesn't like sitting still for long, LOL! We also found we couldn't take him into shows or anything that was really loud (like Mickey's Philharmagic) because he was sensitive to the loud noises. Nursing/feeding never worked for us because he has eating issues anyway, but a pacifier sometimes did the trick. We basically just comforted him the best we could and then took a little break after getting off the ride to help soothe his nerves. It didn't take us long to figure out what kinds of attractions he would tolerate. Like the pp said, the rides are usually short (unless you get stuck on one like we did ). Fortunately, this last trip at 17 months, he did so much better and loved absolutely everything. It was almost like we had a different kid!
HTH,
Cheryl