One4Life takes your child from birth to big kid, surrounding them with trusted Britax safety.

More than just a convertible car seat, this car seat converts through 3 stages so you can use it with your infant as early as 5lbs and allow them to continue using it through all the stages of car seat use (which means up to 120lbs!): a rear-facing infant car seat, to a forward-facing 5-point harness seat, to a high-back belt-positioning booster seat.

With Britax's ClickTight installation, there’s no stressing or struggling. Seat belt paths are fully open, clearing the way for confident installation, and the automatic tensioner takes care of the tightening. A high-strength steel frame, SafeCell crumple zone & V-shaped tether give you total peace of mind while you travel. Mindfully-made from top to bottom, One4Life has a naturally flame-retardant cover with no added FR chemicals.

• Converts from a rear-facing infant seat (5- 50lb) to a forward-facing 5-point harness seat (22-65 lbs) to a high-back belt-positioning booster seat (40- 120lb).
• 10 years of use: One4Life convertible to booster car seat grows with your child from 5 – 120 lbs and up to 63” tall.
• ClickTight® Installation: No stressing or struggling! Unobstructed seat belt paths clear the way for confident installation, and the automatic tensioner takes care of the tightening.
• Washer & Dryer Friendly Fabrics: No more hand washing or waiting for the cover to air-dry. Just quick and easy cleanup, so you can keep moving.
• No Added FR Chemicals: Naturally flame-retardant fabrics & foam with no added FR chemicals.
• 15-Position, Quick-Adjust Headrest & Harness create the proper fit as your child grows.
• Patented V-Shaped Tether with staged-release stitches helps slow and reduce forward movement during a crash.
• High-Strength Steel Frame reinforces the seat structure to help keep it sturdy and stabilized.
• Quick-Push, 9-Position Recline helps you find the most comfortable fit for your child and the best fit for your vehicle.
• SafeCell Technology acts as a crumple zone, absorbing crash energy to help keep it away from your child.
• Easy-Read Level Indicators help you find the correct recline angle when installing the car seat.
• Stay-Put, Soft Comfort Pads help prevent the harness from rubbing against your child’s delicate neck.
• Flip-Forward Buckle Pad stays out of the way for easy boarding; made with extra padding for premium comfort.
• Built-In Cooling Channels & Ventilated Mesh improve air flow to keep your child comfortable.
• Color-Coded Belt Guides make it easy to route the seat belt through the correct paths for rear-facing, forward-facing, and booster mode.
• Removable Cover for easy cleaning without taking off the harness.
• Dishwasher-Safe Cup Holders easily twist out for cleaning between rides.
• Removable Infant Insert helps keep your tiny baby safe and comfortable under 20 lbs.
• Removable Head Pillow provides additional comfort for your growing baby.
• Easy-Pull Harness Adjuster lets you tighten the harness using just one hand.
• Premium Padding & Fabrics for superior comfort and a quiet ride.
• Harness Holder Slots keep the harness straps out of the way while your child gets in and out of the seat.
• 5-Point Safety Harness with diamond weave webbing.
• Tag-Free Headrest supports your child’s head and neck without irritation.