One4Life Slim All-in-One Car Seat

Regular price$449.99
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2026-08-01 00:00:00

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This item is not returnable or refundable. Don't worry! If your order arrives damaged or defective, please notify us within 24h [adhering to White Glove delivery instructions if applicable] to obtain replacement parts or units completely free of charge. Modern Nursery simply chooses to follow the strictest of safety and health guidelines and can't accept returns for this item. See our Refund Policy

From the Same Collection

BPA Free

BPA [bisphenol A] is an industrial chemical found in plastic, epoxy resins, and even food and water containers. This chemical has been linked to adverse health effects in fetuses, newborns and children.

No PFAS

PFAS-free baby products do not contain poly-fluorinated alkyl substances which are a group of around 4,700 industrial chemicals that can be found everywhere around us.

Potential FR Cross-Contamination

While no products sold on Modern Nursery have any added chemical fire retardants, some may be manufactured in the same facilities as others that do and therefore may have potentially been exposed to FR chemicals. If you're looking for a product that is 100% FR-free, we have those too - just look for the Fire Retardant Free badge on the listing!

No Added Formaldehyde

Formaldehyde is something you want to stay away from because it is a cancerous, strong-smelling, colorless gas commonly found in pressed-wood products.

Phthalates Free

Phthalates disrupt the body's hormones and some are known carcinogens. The chemicals from baby gear and wallpaper can be ingested, inhaled or absorbed.

From birth to first outings, to big kid adventures, the One4Life Slim All-in-One Car Seat by Britax is here to grow with your child. As a convertible and harness-2-booster seat in one, the seat converts easily from a rear-facing infant and toddler seat (5-50 lbs) to a forward-facing seat (30-65 lbs), to a high-back booster big kid seat (40-120 lbs, 63"), highlighting its longevity and versatility.

The One4Life Slim All-in-One Car Seat by Britax spotlights a slim outside and a roomy inside with the 17.5" seat designed to fit three across without sacrificing comfort or safety. ClickTight makes installing this seat a 3-step breeze - pinch to open, thread and buckle, click it closed! Adjusting the One4Life Slim to maximize baby's comfort and safety is easy with the 5-point safety harness that provides adjustment points at the hips, shoulders, and between the legs, and the Quick-Push, 9-position recline system with Easy-Read Indicators that helps you find the most comfy fit and the correct angle for your vehicle. And the 15-Position No-Rethread Harness and Headrest ensure the best fit as time goes by and your little one grows, with no rethreading, ever!

The One4Life Slim car seat features premium fabrics such as the woven mélange accents that give the car seat cover a sleek look, while the soft knit fabric and the plush padding and inserts keep baby comfortable during every ride. The high-strength steel frame reinforces the seat, keeping it strong and stable through any bumpy ride. Additionally, you can rest assured knowing that the premium fabrics are naturally flame-retardant and 100% FR free - only the best for sweet baby's skin!

Features:

  • 10 Years of Use: This slim all-in-one car seat grows with your child from 5 to 120 lbs. and up to 63” tall
  • SpaceSaver Design: the 17.5” seat is designed to fit 3 across without compromising on trusted Britax safety and premium comfort. *Britax cannot guarantee 3-across installation fitment in all vehicles
  • Woven Accents on the Exterior and Comfort Pads: Made from recycled polyester
  • Hassle-Free Cleanup: Extra space between the shell and base means you can clean under the seat with ease – and with minimal grooves in the seating area and base, you can wipe it down with no fuss
  • SafeWash Fabrics: No more hand-washing or waiting for the cover to air-dry; just quick and easy cleanup so you can keep moving
  • Three Removable Infant Inserts: Help provide a better fit for infants 20 lbs. and under
  • Accessible Color-Coded Belt Paths: Make it easy to route the seat belt through the correct path for each car seat mode
  • Slide-Out Cup Holders: The dishwasher-safe cup holders slide out with ease for convenient cleaning and click back into place for a secure attachment during rides
  • Cup-Holder-Free Option: Remove the cup holders completely and insert the armrest caps to save additional space
  • Patented V-Shaped Tether with Staged-Release Stitches: Helps slow and reduce forward movement during a crash
  • SafeCell Technology: Acts as a crumple zone, absorbing crash energy to help keep it away from your child
  • Two Layers of Energy Management: The protective seat shell and foam-lined headrest help absorb impact energy and are designed to help keep your child's head, neck, and body safe
  • Soft Comfort Pads: Help prevent the harness from rubbing against your child’s skin
  • Flip-Forward Buckle Pad: Stays out of the way for easy boarding; made with extra padding for premium comfort
  • Built-In Cooling Channels: Improve airflow to help keep your child comfortable
  • Plush Padding: For superior comfort and a quiet ride
  • Easy-Pull Harness Adjuster: Lets you tighten the harness using just one hand
  • Harness Holder Slots: Keep the harness straps out of the way while your child gets in and out of the seat
  • Tag-Free Headrest: Supports your child’s head and neck without irritation 

Free of added fire retardants

Britax is fully transparent about their manufacturing process and guarantee that their car seats are completely free of any added fire retardants. However, their products are manufactured in the same facilities as other gear that does contain FRs so there is a chance of potential FR carryover. We believe in full disclosure and transparency and appreciate Britax's honesty and effort to produce fire resistant products without the addition of chemical fire retardants.

Dimensions: Product Height 24.5"H x 18.5"L x 17.5"W

Weight: 28 lbs


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