The Infa Secure Quattro is a narrow car seat with extended rear-facing. Unfortunately, the harness increment is 40mm, meaning it’s not possible to get a truly tight harness fit. The tether strap originating in the middle also makes installation difficult when there’s an integrated headrest.
Infa Secure have released their A4 baby car seat — the Infa Secure Quattro — with an announcement explaining the new Quattro car seat.
🔤 What is an A4 extended baby car seat?
An A4 baby car seat is an extended rear-facing child restraint designed to rear-face through to a large 30-month-old. It has two rear-facing shoulder height markers — the first is where you must rear-face to, and the second is an optional label you can rear-face to if you wish (for a larger 30-month-old).
📏 Smallest baby car seat on the market

With the release of the Infa Quattro, Infa Secure secured the title of slimmest car seat on the market — a maximum width of 42cm at its widest point, 2cm slimmer than the slim-line AHR (Compaq) from Britax.
Great news for parents with a small SUV or sedan — you can now fit three baby car seats with a minimum back seat width of just 126cm, a full 6cm narrower than previous Britax and Maxi Cosi seats.
🛡️ Air Cocoon Technology
Many parents don’t realise that all Infa Secure car seats are blow-molded, which makes the child restraints inherently safer, since they have air injected within the plastic. Squeeze an Infa car seat today and listen to the air rush in and out, just like one big cocoon around your child. No add-ons, no upgrades, and no extra cost. The Infa Quattro has ACT (Air Cocoon Technology).
💨 Infa Secure Quattro Secur-Air
Infa, as leaders in car safety technology, have innovated a new safety feature — the Secur-Air crumple zone — which works together with Air Cocoon Technology to provide superior head protection for your child.
🎽 Hassle-free harness
The Infa Quattro, like the Infa Secure Evolve/Emerge/Grandeur, is much easier to use than many other child restraints on the market. Features of the Quattro include:
Unlike other child restraints, the Infa Quattro doesn’t need the harness loosened before you lift it to a new position — making it one of the easiest child restraints to use in Australia.
🌬️ Keeping baby cool fabric
Infa have introduced a new hard-wearing, cool and breathable active fabric, which helps keep your child cooler by drawing moisture away from their skin.
🏭 Other A4 car seat manufacturers
Maxi Cosi released their A4 child restraints on 13 July, after an initial release in April 2015 revealed those April A4 restraints weren’t certified by SAI Global, resulting in a number of recalled products.
Maxi Cosi’s A4 range includes the Maxi Cosi A4 Hera and the Maxi Cosi A4 Euro.
📐 A4 height markers
The A4 baby child restraint type was introduced in the 2013 Australian Standard (approved 17 September 2014). An A4 car seat has three shoulder height markers. The lowest marker indicates you can turn your child forward-facing, but you can leave them rear-facing until they reach the middle shoulder height marker.
The highest rear-facing marker is at 39cm.
🔧 Installation
Installation of the Infa Secure Quattro is very easy. The Quattro features a single seat belt path, so there’s no guessing where the seat belt should thread. Most variants include the Safe Grip Clamp, which in many cases makes installation easier than Isofix. If your Quattro doesn’t have a Safe Grip Clamp, contact Mobile Car Seat Fitting in Melbourne on 0420 516 587.
Neutral recommendation
The Quattro earns real praise for being the narrowest extended rear-facing seat on the market with a genuinely hassle-free harness — but the 40mm harness increment and the middle-mounted tether strap (awkward with an integrated headrest) keep it from being an outright recommendation.
❓ Frequently asked questions
Is the Infa Secure Quattro recommended? +
What is an A4 extended rear-facing car seat? +
Is the Quattro really the narrowest car seat available? +
Does the harness loosen easily when adjusting height? +
Does it come with a Safe Grip Clamp? +
What’s the downside of the middle-mounted tether strap? +
Infa Secure Quattro Car Seat Installation
Open Monday to Friday, 9am to 5pm. Servicing Bayside and South East suburbs — mob 0420 516 587.


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