Passenger side. This is because that is the side of the pavement which is where you are most likely to take your baby out. In addition, you are avoiding lifting your loved one out onto the roadside and having to contend with oncoming traffic. Although the driver side is available to fix a child seat it’s just not the best choice. The center rear seat can be used but it would be harder to quickly grab your baby during and accident from the middle of the vehicle. An outside seat is therefore the best option and particularly the passenger side for convenience and added safety.