There is no one definitive answer to this question, as the best way to put Doona in a car depends on the specific vehicle and its size. However, some tips on how to put Doona in a car include: -Making sure the car’s seats are comfortable for both passengers. -Making sure the car has enough space for both drivers and passengers. -Checking the car’s air conditioning and heating systems to make sure they are working properly. -Checking the car’s brakes and tires to make sure they are in good condition.