Nah, leave the VX as is (unless you plan on going 4-wheeling with the newborn).

Instead, sell a couple of your "extra" cars and buy the new 2012 HYUNDAI - "VELOSTER" 3-door Coupe (the Right-Rear door was specifically designed for small 1-child families). It gets a whooping 40 MPG and I'm sure it will become your instant daily-driver and for all road trips with child due to the easy 3rd door loading/unloading. Besides, everybody knows the Right-Rear seat location is the safest for a child seat.

http://www.hyundaiusa.com/vehicles/2012/veloster/

Use the next 9-months to try and sell your "extra" cars and acquire a new 2012 Hyundai - Veloster in advance of the big day. Hmmm, time to ponder.