For families with kids, ensure you follow the children's car safety rules whenever you rent cheap car rentals in Grand Prairie. Babies under 35 pounds or one year old must ride in rear-facing car seats in the car's back seats. After outgrowing a rear-facing car seat, they may ride in baby seats while facing forward. Kids between the ages of four and eight can ride in booster seats and must be safely buckled in the vehicle's back seats. Search rental cars on KAYAK