Strap'em down in the hatch it is!
I def. wouldn't get rid of the car, being it's a financial hit and the child is only going to be this small for a short period of time.
If it were me (and may be some day) I'd probably swap cars w/a family member if I needed to go somewhere, then again - they aren't allowed to drive my car so it's more like
take a family member's car.
