On newer cars, there is a switch (usually marked Passenger Airbag Cut Off Switch) in the car to easily turn on and off the airbags. Typically, the switch is located around the passenger side of the dashboard. Every car is different, so you will need to refer your owner’s manual for specific instructions.
If you own a sports car with only two front seats, it is vital for your child’s safety that the airbags are turned off. And, it is illegal to use a rear-facing car seat in a passenger seat protected by an airbag.
In older cars, however, it may not be possible to turn the airbags off. Luckily, there are products you can get to disable the airbags externally. To get an airbag retrofit on-off switch installed in your car, you will need to take the car to the vehicle manufacturer or to a repair shop.