Our family will be at the 'world' during the Xmas holidays; my DD and SIL and GS (2 yo) will be joining my DH and me for part of the trip. My DD will be six months pregnant with twins. Her doctor has no objection for her to be at WDW, just for her to rest when she feels the need when inside the parks. She does not excercise regularly (before pregnancy); I'm trying to convince her to rent an ECV (or maybe a wheelchair) while in the parks. She said she didn't think she would need one. My question is what has been the experience of other 'Moms to be' with ECVs or wheelchairs during the crowded Xmas holidays?