Infants under 20 lbs must be securely placed in a properly installed rear-facing infant seat. Children under three years old must be fastened into a car seat that is compliant with current federal safety standards. Anyone under 12 years of age must ride in the back seat, which can help to minimize injury during a crash. Violators may be subject to fines for not abiding by Iowa's Safety-Belt Law. Search rental cars on KAYAK