Both ISOFIX and seat belts are methods for securing child car seats, but they differ in terms of ease of use, safety, and compatibility. From many conversations with parents, I have found there is a misconception that ISOFIX is safer, however the answer is more complex than this.  Here’s a breakdown of the pros and cons of each: 

ISOFIX 

What it is: ISOFIX (International Standards Organisation FIX, also called “Latch” in the US) is a system for attaching child car seats to anchor points in a vehicle without using the car’s seat belt. Most modern cars have ISOFIX attachment points built into the seats, typically found at the base between the seat back and cushion. 

 Pros of ISOFIX: 

1. Easier Installation: The purpose of ISOFIX is provide a more straightforward and faster way to install car seats, reducing the chances of incorrect installation.  Although for some vehicles this is not always the case. 
2. Enhanced Stability: It offers a firmer connection to the car frame, reducing seat movement and adding stability. 
3. Standardized Fit: ISOFIX anchors are standardized, meaning ISOFIX-compatible car seats should work with most ISOFIX-equipped vehicles (but not all vehicles). 

Cons of ISOFIX: 

1. Higher Cost: ISOFIX car seats tend to be more expensive due to the technology and additional materials. 
2. Weight and Size Limits: ISOFIX systems may have lower weight limits, so they might not be suitable for older or larger children (usually 18kg and over). 
3. Compatibility Issues: Older cars or utes (trucks) may not have ISOFIX anchors. 

Seat Belt 

What it is: Using a seat belt to secure a child car seat is the traditional method, involving threading the car’s seat belt through specific paths on the car seat to lock it in place. 

Pros of Seat Belt: 

1. Widespread Compatibility: Seat belts are universally available in all cars, so you’re more likely to able to use these car seats in an expanded range of vehicles. 
2. Higher Weight Limits: Since seat belts aren’t constrained by ISOFIX weight limits, they are often better suited for bigger children. 

Cons of Seat Belt: 

1. More Complex Installation: Installing a seat with a seat belt can be more challenging, increasing the risk of incorrect installation.  However, this does largely depend on the car seat design. 
2. Potential for Looseness: Without the rigid anchor points, seats secured with a seat belt may not be as stable as ISOFIX-installed seats. 

Which to Choose? 

In a lot of cases, you don’t need to choose.  Car seats such as Edwards & Co Avery are equipped with both ISOFIX and seat belt installation methods. 

• ISOFIX is generally recommended for younger children or parents who prioritise ease of installation and stability.  This maybe important if you are moving your car seat in and out of your vehicle often.  ISOFIX also requires you to have a more modern vehicle. 

• Seat Belt installation is more universal fitting a broader range of cars and isn’t constrained by your vehicle’s weight limit.  Therefore it’s also the only option as your children grow bigger and taller.  

In general, both systems can be very safe if installed correctly.  As always we recommend consulting with a vehicle installation expert (such as Edwards & Co) and spending the time educating yourself about car seat fitting.  After all, it’s your child’s safety we’re talking about!