Car Seat Buying Guide NZ: How to Choose the Right Car Seat for Your Child
Choosing a car seat can be confusing, especially for first-time parents and caregivers. Should a newborn start in a capsule or a convertible car seat? Is ISOFIX safer than a seatbelt installation? How long should a child stay rear-facing? And when is it actually time to move into a booster seat?
The right car seat depends on your child’s age, height and weight, the stage they are at, your vehicle, and how the restraint can be installed safely in that vehicle.
This New Zealand car seat guide explains the different types of child restraints, what NZ law requires, what to consider before buying, and how to know when your child is ready for the next stage.
You can also browse Babyonline’s full range of car seats and accessories, including infant capsules, convertible car seats and booster seats.
What Does New Zealand Law Require for Child Car Seats?
In New Zealand, children under 7 years old must be properly restrained in an approved child restraint when travelling in a car or van.
Children aged 7 years must use an approved child restraint if one is available. Once children are older, an adult seatbelt may be legally permitted, but being legally old enough to use a seatbelt does not necessarily mean the seatbelt fits them safely.
NZ Transport Agency recommends continuing to use a child restraint or booster seat until a child is approximately 148 cm tall, when an adult seatbelt is more likely to fit correctly.
NZTA also recommends keeping babies and young children rear-facing until at least 2 years old. Do not rush to turn a child forward-facing simply because they have reached a particular birthday — always follow the height and weight limits and instructions for the individual restraint.
For the latest legal requirements and safety advice, see the NZ Transport Agency child restraint guidance.
Important: Every car seat is different. Always follow the child-restraint manufacturer’s instructions as well as your vehicle handbook. If you are unsure whether a restraint is suitable or correctly installed, an NZTA-listed Child Restraint Technician can help you choose and fit one correctly.
What Car Seat Safety Standards Are Recognised in New Zealand?
Car seats used in New Zealand must meet an approved child-restraint safety standard. Unlike some countries, New Zealand recognises restraints certified under several different international standards.
The main standards parents and caregivers are likely to come across are:
Australian/New Zealand Standard – AS/NZS 1754
AS/NZS 1754 is the joint Australian and New Zealand standard for child restraints used in motor vehicles.
Seats approved to this standard use height markers on the restraint to help caregivers determine when a child can use the seat and when they have outgrown a particular mode or stage.
European Standards – ECE R44 and ECE R129
New Zealand recognises both UN/ECE Regulation 44 (ECE R44) and the newer UN Regulation 129 (R129).
ECE R44 restraints are generally classified using weight groups, which is why their instructions commonly give weight ranges for the different stages of the seat.
R129 is a newer standard and classifies child restraints primarily according to the child’s height rather than the older weight-group system. R129 also introduced additional requirements including side-impact testing. Many R129 restraints are commonly described as i-Size seats, although R129 covers more than just i-Size restraints.
All car seats currently sold by Babyonline meet either ECE R44 or R129 European safety standards.
United States Standard – FMVSS 213
New Zealand also permits child restraints that meet the American Federal Motor Vehicle Safety Standard 213 (FMVSS 213), provided they have the required New Zealand approval marking.
American restraints can differ from European and Australian/New Zealand seats in their installation methods, labels, tether requirements and the way their size limits are specified, so it is important to follow the instructions supplied with the particular restraint.
Why Does the Standard Matter?
The standard does not simply tell you whether a restraint is approved. It can also affect:
- how the restraint is installed
- how its size limits are shown
- whether height markers or weight limits are used
- whether a top tether, ISOFIX/LATCH connection or vehicle seatbelt is required
- how you determine when your child has outgrown a particular stage
This is why advice that applies to one type of car seat may not apply in exactly the same way to another.
Whichever approved standard your restraint meets, always follow the manufacturer’s instructions and the limits marked on that particular car seat.
For current information about approved child-restraint standards and how to identify them, see the NZ Transport Agency child-restraint requirements.
What Type of Car Seat Does My Child Need?
The type of car seat your child needs depends mainly on their age, size and stage of development. In New Zealand, the most common types are infant capsules, convertible car seats and booster seats.
Infant Capsules – Usually for Newborns and Young Babies
An infant capsule is a rear-facing car seat designed for newborns and younger babies. One of the main advantages of a capsule is that it can usually be removed from the car while your baby remains safely strapped inside.
Capsules can be installed in different ways depending on the model:
- Directly with the vehicle seatbelt: the capsule itself is secured into the car each time it is used.
- With a stay-in-car base: the base remains installed in the vehicle and the capsule simply clicks in and out of it. Depending on the model, the base may be secured using ISOFIX connectors or the vehicle seatbelt.
A stay-in-car base can be particularly convenient with a newborn because you do not need to reinstall the capsule every time you take it out of the vehicle. You simply click the capsule securely back onto the base.
Some capsules can also attach to a compatible stroller to create a travel system, allowing you to move your baby from the car to the stroller without taking them out of the capsule.
A capsule can be a good choice if you want:
- a removable car seat for your newborn
- quick click-in and click-out use with a compatible base
- easier transfers between the car and home
- compatibility with a stroller or travel system
- a dedicated rear-facing restraint for the early months
Always use the installation method specified by the capsule manufacturer and check that the capsule or base is compatible with your vehicle.
Babyonline has a separate range of newborn and infant capsules.
A capsule is not essential, however. Some families choose to start with a convertible car seat instead.
Convertible Car Seats – From Baby to Toddler
A convertible car seat is designed to be used through more than one stage. Depending on the particular model, it may start rear-facing for a baby and later convert to forward-facing as the child grows.
This can be a practical choice for families who would prefer to buy one seat that lasts longer rather than beginning with a removable capsule.
When choosing a convertible seat, check:
- the minimum size requirements for newborn use
- how long it allows rear-facing
- the maximum height and weight limits
- whether it fits comfortably in your vehicle
- whether installation is by seatbelt, ISOFIX or another approved system
Browse Babyonline’s convertible car seats.
Booster Seats – For Older Children
A booster seat is designed for an older child who has outgrown the appropriate harnessed child restraint but is not yet large enough for the vehicle seatbelt to fit correctly on its own.
Unlike a harnessed car seat, a booster positions the child so the vehicle’s lap-and-shoulder seatbelt sits in the correct position across their body.
High-back booster seats provide a back and head support and usually include guides that help position the vehicle seatbelt correctly.
Some high-back boosters are designed with a removable back. Once the child is older and meets the manufacturer’s requirements, the back can be removed and the booster can then be used as a booster cushion. Not every booster is designed to be used this way, so always follow the instructions and height or weight limits for the particular model.
Browse Babyonline’s booster seats.
Booster Cushions – A Compact Option for Older Children
A booster cushion is a compact booster designed for older children who are still too small for the vehicle seatbelt to fit correctly on its own. Some booster cushions are completely backless, while others have a low or partial back for added support. They are generally smaller and less enclosing than a full high-back booster seat. Their main purpose is to raise the child so the vehicle’s lap-and-shoulder seatbelt sits in a safer position across the body.
Booster cushions can be convenient for older children, second vehicles, grandparents’ cars or situations where a full high-back booster is no longer needed.
However, a booster cushion should only be used when:
- the child meets the minimum requirements specified by the booster manufacturer
- the vehicle has a suitable lap-and-shoulder seatbelt
- the seatbelt sits correctly across the child’s shoulder and chest rather than the neck
- the lap portion of the belt sits low across the hips rather than across the stomach
- the vehicle seat or head restraint provides appropriate support behind the child’s head
Do not move a child to a booster cushion simply because it is smaller or more convenient. A high-back booster may continue to provide a better fit and support for a younger or smaller child.
NZ Transport Agency recommends continuing to use an appropriate child restraint or booster until a child is around 148 cm tall and the adult seatbelt fits them correctly.
360° Rotating Car Seats – Easier Access and Multi-Stage Use
A 360° rotating car seat is a convertible car seat with a seat that can rotate on its base. Depending on the model, it may turn towards the car door to make it easier to put your child in, fasten the harness and lift them out.
Many 360° seats can be used rear-facing for babies and younger children, then rotated to a forward-facing position once the child meets the requirements for that stage.
A rotating seat can be particularly useful if:
- you find it difficult to reach into the car to fasten a child
- you have a smaller vehicle or limited space around the door
- you want a seat that can be used through several stages
- you expect to keep your child rear-facing for longer
- regularly lifting a growing baby or toddler into a fixed seat is uncomfortable
The rotating feature is mainly about convenience and easier access. You should still choose the seat based on its approved size limits, installation requirements, compatibility with your vehicle and suitability for your child.
Some 360° seats use ISOFIX and a support leg, while other installation systems may also exist depending on the model. Always follow the instructions supplied with the particular restraint.
Where Should a Car Seat Be Positioned in the Car?
The safest place for a child restraint is usually in the back seat.
If possible, place the restraint in a seating position where it can be installed securely and correctly according to both the car seat instructions and your vehicle handbook.
Important safety points
- Rear-facing restraints must never be used in front of an active passenger airbag.
- If a restraint is placed in the front seat, always follow the vehicle and restraint manufacturer’s instructions very carefully.
- Not every seating position in a car is equally suitable for every restraint. Some positions may work better than others depending on anchor points, seat shape, leg room and how the restraint fits.
Which rear seat position is best?
There is no single rule that suits every vehicle. The best position is the one where:
- the restraint can be installed correctly
- it fits securely
- the child can be harnessed properly every time
- the seat does not interfere with the safe use of other seats in the vehicle
For some families, this may be behind the passenger seat, behind the driver, or in the centre rear seat if the vehicle and restraint allow it.
How Are Car Seats Installed in a Vehicle?
Car seats can attach to a vehicle in several different ways. The correct method depends on the car seat, its safety standard and your vehicle.
Vehicle Seatbelt
Some restraints are installed using the vehicle’s seatbelt. The belt passes through specific guides or a belt path on the restraint and secures it to the vehicle seat.
Some infant capsules can also be secured directly with the vehicle seatbelt each time they are placed in the car.
Seatbelt With a Top Tether Anchor
Many child restraints use the vehicle seatbelt together with an upper tether strap.
The seatbelt secures the main body of the restraint, while a tether strap from the back or top of the car seat clips onto a dedicated child-restraint anchorage point in the vehicle.
These tether anchor points are separate from ISOFIX and may be located behind the vehicle seat, on the rear parcel shelf, in the luggage area or elsewhere depending on the vehicle.
If your restraint requires both the seatbelt and top tether, both need to be fitted correctly.
ISOFIX
ISOFIX allows a compatible car seat or base to connect directly to fixed lower anchor points built into the vehicle.
These anchors are normally located between the backrest and seat cushion of the rear seat. Usually vehicles have an ISOFIX symbol or label showing where they are located.
The restraint has connectors that clip directly onto these anchors.
Depending on the restraint, ISOFIX may also be used together with:
- a top tether strap, or
- a support leg that extends from the restraint or base to the vehicle floor.
Always follow the manufacturer’s instructions for that particular seat.
Although ISOFIX uses standardised anchor spacing, not every seating position in an ISOFIX-equipped vehicle has its own ISOFIX anchor pair, and the shape and location of the anchors can affect compatibility with a particular restraint. Always check that the restraint is approved and fits correctly in the seating position you intend to use.
Stay-in-Car Capsule Bases
Some newborn capsules use a separate base that remains installed in the vehicle.
Depending on the model, the base may be secured using:
- ISOFIX connectors
- the vehicle seatbelt
- additional features such as a support leg
Once the base is correctly installed, the capsule clicks in and out of it, which can make everyday use much easier with a newborn.
Which Installation Method Is Best?
There is no single installation method that is best for every restraint.
The important thing is that the car seat:
- is suitable for your child
- is compatible with your vehicle
- is installed using the method approved for that particular restraint
- uses any required tether, support leg or anchorage correctly
- is fitted securely every time
If your vehicle has ISOFIX, that does not mean every car seat can be installed using ISOFIX. Use only the installation method approved for your particular car seat. Some seats use ISOFIX, some use the vehicle seatbelt, and some allow more than one approved method. Always follow the manufacturer’s instructions.
NZ Transport Agency provides guidance for installing both ISOFIX/LATCH and seatbelt-secured child restraints.
When Should My Child Move to the Next Car Seat Stage?
Children should move to the next stage based on how they fit their current restraint and the limits of that particular seat, rather than simply because they have reached a certain birthday.
Different approved car-seat standards use different ways of showing limits — for example, some rely mainly on weight, some on height, and some use shoulder-height markers. Always follow the label and manufacturer’s instructions for the restraint you own.
When Has My Baby Outgrown Their Capsule or Rear-Facing Seat?
Your baby may be ready for a larger restraint when they reach the maximum height or weight allowed by the manufacturer.
Other signs can include:
- reaching the relevant height marker on restraints that use them
- the child’s head getting close to the top of the restraint, where this is part of the manufacturer’s fit guidance
- exceeding the stated weight or height limit for rear-facing use
Feet extending beyond the end of the restraint are not, by themselves, a reason to turn a child forward-facing.
Outgrowing an infant capsule also does not mean your baby needs to face forward. They can move into a larger rear-facing convertible car seat instead.
NZ guidance recommends keeping children rear-facing for as long as the restraint allows, and at least until around age 2.
When Can My Child Move From Rear-Facing to Forward-Facing?
Do not turn your child forward-facing just because their legs look long or because they have reached a particular age.
Keep them rear-facing until they reach the rear-facing limits of their particular restraint. Some car seats allow rear-facing for considerably longer than others.
When Can My Child Move Into a Booster Seat?
A child is ready to leave a harnessed forward-facing restraint when they have reached its maximum approved height or weight and also meet the minimum requirements of the booster seat they are moving into.
A booster uses the vehicle’s seatbelt rather than a built-in five-point harness, so the child also needs to be able to sit correctly for the whole journey.
When Can My Child Stop Using a Booster?
NZ guidance recommends keeping children in a booster until they are around 148 cm tall and the adult seatbelt fits correctly. Many children may still need a booster until around age 12.
A useful check is the five-step seatbelt test:
- Can your child sit with their back right against the vehicle seat?
- Do their knees bend comfortably over the edge of the seat?
- Does the shoulder belt cross the shoulder rather than the neck?
- Does the lap belt sit low across the hips and upper thighs rather than the stomach?
- Can they stay sitting correctly like this for the entire journey?
If the answer to any of these is no, they are likely to get a better seatbelt fit by continuing to use an appropriate booster seat.
What Should I Check Before Buying a Car Seat?
Before choosing a car seat, check more than just your child’s age. A seat may be approved and suitable for your child but still be inconvenient or difficult to install correctly in your particular vehicle.
Consider these points:
- Your child’s current size: Check the minimum and maximum height or weight limits for the restraint, depending on the standard it meets.
- How long the seat can be used: Look at both the starting and upper limits. For a baby, a seat that allows longer rear-facing use may last considerably longer before you need the next stage.
- Your vehicle: Check that the restraint fits the seating position you intend to use. A large rear-facing or rotating seat can take up considerably more space than expected.
- Installation method: Find out whether the seat uses the vehicle seatbelt, ISOFIX, a top tether, support leg, or a combination of these. Make sure your vehicle has the required anchor points.
- Ease of everyday use: Try to imagine fastening and adjusting the harness every day. Features such as rotation, an easily adjustable headrest or a removable capsule can make a real difference in everyday use.
- More than one vehicle: If the restraint will regularly move between cars, consider how easy it is to install correctly each time. With an infant capsule, an additional compatible base may also be useful for a second vehicle.
- Travel-system compatibility: If you are buying a newborn capsule, check whether it can attach to your stroller and whether adapters are required.
- The approved safety standard: Check the restraint carries an approved standard recognised in New Zealand and follow the instructions that apply to that particular restraint.
If possible, check the restraint in the vehicle before making your final choice. An NZTA-listed Child Restraint Technician can also help you choose a suitable restraint and show you how to install it correctly.
Is It Safe to Buy a Second-Hand Car Seat?
A second-hand car seat can sometimes be suitable, but you need to know its history and condition before using it.
Be cautious with a restraint if you do not know where it came from or how it has been used.
Before using a second-hand car seat, check:
- it meets a child-restraint safety standard approved for use in New Zealand
- it has not been involved in a crash
- it has not reached the manufacturer’s stated expiry or recommended service-life limit
- the shell, harness, buckle and other parts are not damaged, cracked, frayed or missing
- all required inserts, covers, tether straps, bases and other components are present
- the original instructions are available, or can be obtained from the manufacturer
- labels showing the model, safety standard and other important information are still readable
Avoid using a restraint if its history is unknown, if it has been involved in a crash, or if you cannot confirm that it is complete and still within the manufacturer’s permitted period of use.
NZ Transport Agency requires second-hand restraints, just like new ones, to meet an approved child-restraint standard. Plunket also recommends taking particular care when purchasing or borrowing a used car seat.
Car Seat FAQs for Parents and Caregivers
Is ISOFIX safer than a seatbelt-installed car seat?
ISOFIX does not automatically make a car seat safer simply because it uses ISOFIX. Its main advantage is that it connects directly to fixed anchor points in the vehicle and can make correct installation easier with compatible restraints.
A correctly installed, approved seatbelt-secured restraint will also provide a secure installation. The important factors are choosing a restraint that is suitable for your child and vehicle and installing it exactly as the manufacturer specifies.
Can my child wear a puffer jacket in a car seat?
Bulky jackets and thick clothing should be removed before fastening a child into a harnessed car seat.
In a crash, bulky clothing can compress and leave additional space between the harness and the child. The harness should sit firmly and flat against the child.
On cold days, secure your child in the harness first and then place a blanket or jacket over them for warmth.
Can a car seat be installed in the front passenger seat?
A child restraint should normally be installed in the back seat. If you are considering using the front passenger seat, first check your vehicle handbook to see whether a child restraint is permitted there and whether the passenger airbag can be safely deactivated. Never place a child restraint in front of an active passenger airbag, as deployment of the airbag could seriously injure the child.
Is the centre rear seat always the safest position?
Not necessarily. The centre rear position can be a good location if the particular restraint can be installed correctly there.
Some vehicles do not have ISOFIX anchors, suitable tether points or an appropriate seatbelt arrangement in the centre position. The shape of the vehicle seat can also affect how securely a restraint fits.
The best position is one in which your particular restraint can be correctly and securely installed according to both the car-seat and vehicle instructions.
Can I use a car seat bought overseas in New Zealand?
Not every car seat sold overseas is automatically approved for use in New Zealand.
The restraint must meet a child-restraint standard recognised in New Zealand and carry the appropriate approval markings. This is particularly important when buying a restraint overseas or ordering one from an international website.
Check the approval label on the restraint and read the beginning of this article or see the current NZ Transport Agency child-restraint requirements before using the restraint in New Zealand.
Does my newborn have to use an infant capsule?
No. A newborn does not necessarily need to start in a removable infant capsule.
Some convertible car seats are approved for use from newborn size and can be used rear-facing from birth. A capsule may be more convenient because it can be removed from the vehicle and may attach to a compatible stroller, while a convertible car seat generally stays installed in the vehicle and may last considerably longer.
Whichever option you choose, check that the restraint is approved for your newborn’s size, fits your vehicle correctly and allows a secure harness fit.
Choosing the Right Car Seat for Your Child
There is no single car seat that will be right for every child or every vehicle. The best choice is one that:
- is appropriate for your child’s current size and stage
- meets an approved safety standard recognised in New Zealand
- can be installed correctly in your vehicle
- allows your child to remain rear-facing for as long as appropriate
- fits your family’s everyday needs
- can be used correctly every time you travel
For a newborn, the main decision is often between a removable infant capsule and a convertible car seat that can be used for longer. As your child grows, the focus shifts to the limits of their current restraint, correct harness and seatbelt fit, and knowing when they are genuinely ready for the next stage.
Browse Babyonline’s car seat range by type: