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All-In-One Car Seats FAQs

• What are the weight and height limits for the Britax® One4Life® Slim in rear-facing mode?

  Use rear-facing for children who weigh between 5 and 50 lbs. (2.3 and 22.7 kg) and whose height is 18-49 in (45.7-124.5 cm).

• What are the weight and height limits for the Britax One4Life Slim in forward-facing harness mode?

  Use forward-facing with a harness for children who weigh between 30 and 65 lbs. (13.6 and 29.5 kg) and whose height is 35-49 inches (88.9-24.5 cm).

• Can I use the LATCH system on my One4Life Slim for a child weighing more than 40 lbs.?

  Do not use the lower anchors of the LATCH system to attach this child restraint when restraining a child weighing more than 40 lbs. with the internal harnesses.

• When can my child use the Britax One4Life Slim in booster mode?

  Use in booster mode only with children who weigh between 40 and 120 lbs. (18.1 and 54.4 kg) and whose height is between 44 and 63 in (111.8 and 160 cm). Britax strongly recommends children should ride in harness mode until they exceed the weight or height limits specified.

• What are the weight and height limits for the One4Life in rear-facing mode?

  Use rear-facing for children who between 5 and 50 lbs. (2.3 and 22.7 kg) or until the child’s head is 1 inch (2.5 cm) below the top of the headrest. The height range for rear-facing mode is from 18 to 49 in (45.7 to 124.5 cm), ensuring that the child remains within the safety limits for optimal protection.

• What are the weight and height limits for the One4Life in forward-facing harnessed mode? 

  Use forward-facing with a harness for children who weigh between 22 and 65 lbs. (10 and 29.5 kg) and whose height is 49 in (124.5 cm) or less.

• What are the weight and height limits for booster mode on the One4Life?

  The booster mode is suitable for children who weigh between 40 and 120 lbs. (18.1 and 54.4 kg) and whose height is 44 to 63 in (111.8 to 160 cm).

• How should the harness straps on the One4Life be positioned in rear-facing mode?

  The harness straps should be positioned at or just below the child’s shoulders. The top of the child’s head MUST be at least 1 inch (2.5 cm) below the top edge of the headrest.

• How should the harness straps be positioned in forward-facing mode on the One4Life?

  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.

• When should I remove the infant position pillow on the One4Life car seat?

  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).

• What is the proper recline position for booster mode on One4Life?

  Use only the "B" recline position when the car seat is in booster mode.