Britax Safe N Sound Millenia Convertible Car Seat Reviews - Tell Me Baby
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Britax Safe-n-Sound Millenia™ Convertible Car Seat

Britax® Safe-n-Sound®’s Millenia™ offers advanced safety features. Designed with dual layer revolutionary Side Impact Cushion Technology™ (SICT™) providing your child the ultimate side impact protection. Thermo5® high performance fabric with Bamboo Charcoal means your child will travel in quality and comfort.

Where to buy

Britax Safe-n-Sound
$679.00 Buy now

Top Features

Forward Facing

Easy adjust headrest

ISOFIX Compatible

Side Impact Cushion Technology (tm)

Thermo5(tm) Fabric

Rearward Facing Birth-2-3 Years


4.9 Users 65 reviews (65)
5 52
4 13
3 0
2 0
1 0

What the community is saying

worth every pennyfantastic safety reviewspeace of mindbest convertible car seatcomfortablesnugsafe
August 22, 2019
The best car seat

Our firstborn was only 2.2kg when we brought him home from the hospital in the Britax Millennia and with the infant insert it cradled our tiny baby safely. Now an active 2 year old and still rear facing it is a wonderful seat! The IsoFix installation method is so quick,…Read More

July 17, 2019
Great Car Seat

This is a great car seat. It has the infant insert to help make little babies fit more comfortably. The base isn't too big either so fit well onto our car seat. It has ISOFLEX fitting which made it very easy to install. The buckles are very easy to use…Read More

June 26, 2019
Great Carseat

I think my child is much more comfortable in this chair than the previous one we had. We had it professionally installed so we haven't wanted to remove at all. It is much more stable than the seat we previously had too. Takes up the same amount of room or…Read More

June 13, 2019
So happy with this car seat

Our little one has been innthis seat since he was a newborn. It is so snug and just looks so secure. It must be comfy- bub sleeps in it every trip, whether its 10 minutes or 2 hours. The ajustable straps make it so easy to fit every time. I…Read More

May 25, 2019

We bought this after seeing a Britax stall at a baby expo. I was immediately sold on the safety features. And because of all extra padding and upholstery it is comfortable for baby. We put baby in this at 3 months. Before that we had a capsule. And she much…Read More

Product Features

Product Features

Product Features



  • Colours: Pebble Grey, Midnight Navy, Silhouette
  • Suitability: From birth to 4 years (approx.)
  • Product Weight: 8.9kg (approx.)
  • Dimensions- Rear Facing (H x D x W): 600(min) – 700(max) x 600 x 385(base) – 470(max) mm
  • Dimensions- Forward Facing (H x D x W): 640(min) – 810(max) x 390 x 385(base) – 470(max) mm

Key Features

Key Features

  • Equipped with ISOFLEX™ Connectors to provide a simple, firm connection into a vehicle with ISOFIX low anchorages in conjunction with top tether. ISOFIX is an alternative method of installation that may reduce mistakes that are associated with traditional seat belt installation.
  • SIDE IMPACT CUSHION TECHNOLOGY (SICT™) – HEAD PROTECTION. Unique SICT™ layer provides 180 degree protection around a child’s head. SICT™ minimises the energy generated in a side impact crash.
  • REAR FACING FOR LONGER: Your child can remain rearward facing until they are approximately 2-3 years old, which is safer for your child.
  • ACTIVE HEAD RESTRAINT (AHR™): Designed specifically with deeper side wings that shield and contain your child’s head in a side impact crash. AHR™ grows with your child working with SICT™ to contain your child’s head and to minimise impact forces.
  • THERMO5™: This high performance fabric with Bamboo Charcoal delivers the premium comfort your baby deserves.
  • HASSLE FREE HARNESS: Single handed height adjustable headrest and harness allows the seat to grow with your child without the need to remove and re-thread the harness. Reducing the risk of incorrect installation and enhancing correct harness fit.
  • FLEXI INFANT SAFETY CUSHION™: This cushion includes EVA composite material that provides support and protection for a small baby absorbing energy during a side impact crash.
  • EZ-BUCKLE SYSTEM: This system retains the harness buckle in a forward position and prevents the child from sitting on the buckle when boarding.


Q: Is an Infant Carrier better than a Convertible Seat?
A: Convertible Car Seats and Infant Carriers are tested to comply with the Australian Standard. The major advantage of an Infant Carrier is that the baby can be moved into and out of the car without being disturbed - enabling you to be out and about. Your purchase decision should be based on suitability for child together with size (fitment in smaller car), features (seat saver, canopy, support inserts, harness pads), materials (feel of fabrics), and ease of fitting. Both will protect your child in an accident.
Q: What is a convertible car seat?
A: A convertible car seat is a child seat that "converts" from rear facing for infants and small toddlers to forward facing for children. Britax convertible car seats can accommodate children up to approx. 4 years of age.
Q: Why does my baby have to travel rearward facing?
A: In a frontal accident it is safer to spread the forces of an accident across a fully supported back than to be suspended in a harness. Additionally a baby’s head is largely unsupported and vulnerable to being thrown violently forward if in a forward facing restraint.

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Britax Safe-n-Sound
$679.00 Buy now

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