First of all..............my mother had the BEST advice. "They are easier to take care of on the inside than on the outside" That being said, early pregnancy would probably be best. Later pregnancy is tough on your back and legs.........all of that walking!! OUCH! I want to add one comment on taking newborns to Disney. Newborns have not had all of their immunizations. There are people at Disney from ALL over the world. Other countries' immunizations policies are not the same as in the US. I would never risk the disease exposures with these tiny ones. A few years back, I took care of a 5yo who came to my ER straight off the plane from Disney. The child was infected with bacterial meningitis (a potentially life threatening condition). Every mother needs to use their heads when it comes to their little lives that have been entrusted to them..........no matter how much you love Disney. Wait until they've had all of their baby shots.