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For the Britax One4Life and One4Life Slim, use rear-facing for children weighing between 5 and 50 lbs (2.3 and 22.7 kg) and whose height is 18-49 in (45.7-124.5 cm). Additionally, the top of the child’s head must be at least 1 in (2.5 cm) below the top edge of the head restraint.
For the Britax One4Life and One4Life Slim, use in forward-facing harness mode for children weighing between 30 and 65 lbs (13.6 and 29.5 kg) and whose height is 35-49 in (88.9-124.5 cm). Additionally, the top of the child’s ears must be below the top of the head restraint.
For the Britax One4Life & One4Life Slim, use in booster mode only with children weighing between 40 and 120 lbs (18.1 and 54.4 kg) and whose height is 44-63 in (111.8-160 cm). Britax strongly recommends that children should ride in harness mode until they reach the maximum weight or height limit specified.
When installing your One4Life or One4Life Slim using the lower anchor attachments, please follow these guidelines (as outlined in the user guide):
Rear-Facing Installation:
Forward-Facing (Harness Mode) Installation:
Once your child exceeds these limits, install the car seat using the vehicle seat belt (and tether if forward-facing). We state in our user guides that the vehicle lap-shoulder belt installation is the preferred method when using ClickTight to install our car seats.
The harness straps should be positioned at or just above the child’s shoulders. The top of the child’s ears should remain below the top of the headrest.
The infant insert can be used with infants weighing 20 lbs. (9.1 kg) or less. Do not use with infants weighing more than 20 lbs. (9.1 kg).
Use only the "B" recline position when the car seat is in booster mode.
We understand it can be frustrating when your seat cover doesn’t stay in place. Here are a few things to check: