[RM2016]

I think for one day for a two year old Magic Kingdom would be much better for things they can go on and I think there is only Dinorama and Navi without height restriction and the whole Avatar area will be extremely busy, not pleasant in the heat for a pregnant lady! You could get a one day hopper and go in the evening, you have a decent change of getting on FOP with around 60 min wait near closing.