We took our DS to DL when only 10 months, the biggest problem we had was carrying him in line. You can't take the stroller in line, and he couldn't stand yet. It got to be a bit much. But they didn't have FP for most rides. We waited for Dumbo 40min, pasing DS back & forth! Go early to Fantasyland, then relax! To go on rides a 2nd time, get 1 FP for Pooh & 1 for Peter Pan, and each of you take them on again. Besides FL try Peoplemover, Jungle Cruise, Alladdin Carpets maybe Pirates. Our DS liked it, but he wasn't afraid of the dark yet, now he is.
Have a wonderful vacation!