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Britax Safe n Sound Millenia - Tips on how to install

Posted by Paul Scott on May 21, 2020

Britax Safe n Sound Millenia - Tips on how to install

The Britax Safe N Sound Millenia SICT is easy to install and is equipped with advanced safety features. Cutting edge features such as Side Impact Cushion Technology (SICT TM) ensure your child superb side impact protection and the unmatched Thermo 5TM fabrics provide premium comfort and quality.

Paul goes through how to install the car seat first in rear facing and forward facing via a)  isofix, b) belt, c) a 'gated buckle'. Please watch our youtube video (at the bottom of the page) for more details. 

Here are some features of the car seat: 


Head Protection

Exclusive Side Impact Cushion Technology (SICT TM) layer ensures 180 degree protection around your child’s head. SICT diminishes the energy generated in a side impact crash. ISOFIX COMPATIBLE allows direct connection to your vehicle's low anchorage points.


SAFEGUARD your child’s head with the Active Head Restraint (AHRTM). The Millenia SICT continues to benefit from the AHR which has been a major feature of the previous Millenia. The deep side wings shield and contain your child’s head in a side impact crash. The SICT airbag is attached to the side of the AHR which grows with your child, working with the SICT to surround your child’s head and minimises impact forces.


connectors come with visual attachment indicators to confirm the seat is correctly attached to the vehicle. The ISOFLEX connectors also have a visual tension indicator to confirm the seat is installed firmly into the ISOFIX low anchorages in conjunction with the Top Tether. ISOFIX is an alternative method of installation that some parents might find easier to complete correctly and therefore might consider safer. ISOFIX seats are particularly useful if a child restraint is moved from one ISOFIX compatible vehicle to another ISOFIX compatible vehicle.

Easy Recline

The Millenia has 4 recline stages in forward facing mode including upright position.

Flexi Infant Safety Cushion

This cushion includes inner EVA composite material that provides support and protection for a small baby, absorbing energy during a side impact crash. Your baby rests on another cover of Thermo 5TM Bamboo fabric with specially designed ventilation giving the premium comfort they deserve. The cushion is two tone complimenting the seat and is fully reversible.

Hassle Free Harness Adjustment

Easy to adjust with just one hand. Simply pull up the RED lever on top of the headrest, and the harness adjusts also. The seat grows with the child without having to remove and rethread the harness, reducing the risk of incorrect installation and ensuring correct harness fit.

EZ Buckle

EZ-Buckle retains the harness in a forward position preventing the child from sitting on the buckle when boarding.

Rear Facing For Longer

The Millenia car seat has shoulder height indicators allowing seat to be Rearward facing for longer, which is safer. There is a shoulder height indicator showing the minimum requirement for rear facing and another indicator above showing the maximum height recommendation for Rear Facing. This will be between 2 to 3 years.

Full Specification

Suitability From 0-4 Years (approx) Weight: 8.9kg
Rear Facing Height: 60cm -70cm Depth: 60cm Width: 38-47cm
Forward Facing Height: 64cm Depth: 60cm Width: 38-47cm

Check out our Youtube Review for more details

Britax Instructional Manual

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Last Modified: 21 March 2021
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