Britax Grow With You Harness-to-Booster Car Seat – Mod Black

The Britax Grow With You™ Harness-to-Booster Car Seat in Mod Black takes your child from toddler to big kid in one seat. Use it forward-facing with a 5-point harness from 13.5kg to 30kg, then tuck the harness away and it becomes a high-back belt-positioning booster up to 54kg and 160cm tall.

It's a simple, no-fuss version of the Grow With You. Instead of ClickTight®, it installs with premium quick-push lower connectors, and at 10.4kg it's lighter than the ClickTight model. You still get the same harness and booster limits, the same 9-position harness and trusted Britax protection.

Two layers of side impact protection, an energy-absorbing shell and a foam-lined headrest surround your child's head, neck and torso, while SafeCell® technology in the base acts as a crumple zone to absorb crash energy. Armrests, two built-in cup holders and soft harness comfort pads keep bigger kids happy on every trip.

Key Features

• Harness-to-Booster, 2 Modes – Forward-facing 5-point harness (13.5–30kg) and high-back booster (18–54kg).
• Quick-Push Lower Connectors – Simple, secure installation in harness mode.
• 9-Position Headrest & Harness – Adjusts with one hand as your child grows.
• SafeCell® Technology – A crumple zone in the base that absorbs crash energy.
• Two Layers of Side Impact Protection – An energy-absorbing shell and foam-lined headrest.
• Patented V-Shaped Tether – Helps reduce forward movement in a crash.
• Easy Harness Storage – The 5-point harness tucks away when you switch to booster mode.
• Colour-Coded Belt Guides – Help you and your child route the seatbelt correctly in booster mode.
• 2-Position Recline – For comfort in harness mode.
• 2 Built-In Cup Holders – Plus armrests for bigger kids.
• Stay-Put Comfort Pads – Soft harness pads for a comfortable fit.
• Lightweight – 10.4kg, easier to move between cars.

Why Parents Choose the Grow With You (Mod Black)

• Everything you need, nothing you don't: The same harness and booster limits as the ClickTight version, without the ClickTight system.
• One seat from toddler to big kid: Harness for younger children, then a high-back booster up to 54kg, so there's no separate booster to buy later.
• Lighter to move: At 10.4kg it's easier to swap between cars.
• Comfortable for big kids: Armrests, two built-in cup holders and soft comfort pads.

Grow With You (Mod Black) vs Grow With You ClickTight

Both seats share the same harness and booster limits and the same 9-position harness. The Mod Black installs with quick-push lower connectors. The ClickTight version adds Britax's easiest seatbelt installation system, a steel frame, an impact-absorbing base and a SafeWash® cover.

Want the easiest installation? See the Britax Grow With You ClickTight Harness-to-Booster. Buying from birth? The Britax One4Life Slim covers rear-facing, harness and booster in one seat.

Specifications

Britax recommends keeping your child in the 5-point harness until they exceed its weight or height limit. In New Zealand, children must use an approved child restraint until their 7th birthday.

Why Buy the Britax Grow With You from Babies.co.nz

• Free installation: When you collect your Grow With You from our East Tāmaki store, our Certified Child Restraint Technicians will install it free of charge and show you how to adjust it as your child grows. Book your installation.
• See it in store: Visit our East Tāmaki showroom in Auckland to see the Grow With You and compare it with other Britax seats.
• Price Match Promise: Seen it cheaper at another NZ baby retailer? We'll match the price and give you 5% back in Rewards.
• Free shipping on orders over $200, plus Rewards on every eligible purchase.

Two layers of side impact protection: energy-absorbing shell and foam-lined headrestSafeCell® technology crumple zone absorbs crash energyPatented V-shaped tether

• Premium fabrics and padding
• Armrests and 2 cup holders
• Stay-put harness comfort pads
• 9-position harness and headrest adjusts with one hand
• 2-position recline

We offer fast NZ-wide shipping, including free shipping on orders over $200 (exclusions apply), with most in-stock orders dispatched within 1–2 business days. If you change your mind, eligible unused items can be returned within 14 days for store credit, provided they’re in original packaging with proof of purchase.

Some items including clearance, hygiene, consumables, mattresses, gift cards and personalised products are non-returnable. Return shipping costs apply, and any damaged or faulty items should be reported as soon as possible so we can help.

View our full Shipping & Delivery and Returns Policy for more information.