Britax One4Life All-in-One Car Seat
The Britax One4Life All-in-One Car Seat is designed to grow with your child from birth through the booster years. It starts rear-facing from 5–50 lbs, transitions to forward-facing harness mode from 22–65 lbs, and later converts into a high-back belt-positioning booster for children from 40–120 lbs.
Britax ClickTight® installation helps simplify secure vehicle installation, while a high-strength steel frame, energy-absorbing crumple zone, patented V-shaped tether and two layers of side-impact protection are designed to help manage crash forces throughout multiple stages of use.
One Car Seat for Up to 10 Years
The One4Life combines three child-restraint stages in one seat: rear-facing, forward-facing with a five-point harness, and high-back belt-positioning booster mode.
Its extended rear-facing capacity supports children up to 50 lbs, while the final booster stage accommodates children up to 120 lbs and 63" tall. The product has a useful life of 10 years.
One4Life Key Features
- All-in-one design converts from rear-facing to forward-facing harness and high-back booster modes
- Rear-facing weight range of 5–50 lbs
- Forward-facing harness range of 22–65 lbs
- High-back belt-positioning booster supports children from 40–120 lbs
- ClickTight® installation helps simplify secure vehicle installation
- High-strength steel frame reinforces the car seat structure
- Energy-absorbing crumple zone helps manage crash forces
- Patented V-shaped tether helps reduce forward movement in a crash
- Two layers of side-impact protection surround the child's head, neck and torso
- 15-position no-rethread harness and headrest adjust together with one hand
- Nine-position quick-adjust recline provides flexible child comfort and vehicle fit
- Easy-read level indicators help guide the correct installation angle
- Plush foam padding provides additional support and comfort during everyday rides
- SafeWash® cover is machine washable and dryer safe
- Knit fabric is naturally flame resistant
Britax One4Life Specifications
- Rear-facing weight: 5–50 lbs
- Rear-facing height: Up to 49"
- Forward-facing weight: 22–65 lbs
- Forward-facing height: Up to 49"
- Booster weight: 40–120 lbs
- Booster height: 44–63"
- Product weight: 30 lbs
- Product dimensions: 20.5" L × 19.5" W × 25" H
- Headrest fully extended height: 33.5"
- Fully reclined depth: 30"
- Fully reclined with headrest fully extended: 35.5"
- Seating area depth: 13.25"
- Seating area width: 11"
- Shoulder width: 14"
- Harness slot heights: 15 positions from 9–19"
- Buckle strap positions: 5.5", 6.75" and 8.75"
- Useful life: 10 years
ClickTight® Installation
ClickTight® is designed to make installation more straightforward by using the vehicle seat belt in three basic steps: open the panel, route and buckle the belt, then close the ClickTight panel.
This system helps parents achieve a secure installation without relying on complicated belt routing or excessive force.
Side-Impact and Structural Protection
Two layers of side-impact protection surround the child's head, neck and torso, while the steel frame and energy-absorbing crumple zone help reinforce the seat and manage crash forces.
The patented V-shaped tether is designed to help reduce forward movement when the seat is installed in forward-facing mode.
Growing Fit and Comfort
The 15-position headrest and harness move together without rethreading, making it easier to adjust the seat as your child grows. Nine recline positions and easy-read level indicators help balance vehicle fit with everyday comfort.
Featured Britax Car Seat Accessories
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Designed to Grow From 5 to 120 lbs
From rear-facing infant use through forward-facing harness mode and eventually high-back booster mode, the One4Life is designed to provide one long-term seating solution across multiple stages.
Easy-Care SafeWash® Cover
The SafeWash® cover is safe to machine wash and dry, helping make everyday cleanup easier. Its knit construction is naturally flame resistant for added convenience without complicated fabric care.
