Britax Marathon User Manual
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Use only in a rear-facing position when using restraint with an infant
weighing less than 20 pounds (9 kg) . The American Academy of
Pediatrics recommends rear-facing until at least 1 year of age and 20
pounds .
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Use only with children who weigh between 5 and 65 pounds (2 .3 and
29 kg) and whose height is 49 inches (124 cm) or less . Rear facing
5–33 pounds (2 .3–15 kg) and forward-facing 1 year and 20 pounds to
65 pounds (29 kg) .
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Snugly adjust the belts provided with this child restraint around your
child . A snug strap should not allow any slack . It lies in a relatively
straight line without sagging . It does not press on the child’s flesh or
push the child’s body into an unnatural position .
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Secure the top anchorage strap provided with this child restraint .
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Secure this child restraint with the vehicle’s LATCH system if available
or with a vehicle belt .
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Follow all instructions on this child restraint and in the written
instructions located on lanyard, under cover in front of seat .
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Register your child restraint with the manufacturer .
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Use vehicle belt (not LATCH connectors) for installations with children
weighing more than 48 pounds (21 kg) . Refer to the vehicle's owner's
manual or contact the vehicle manufacturer for the maximum weight
rating for their LATCH anchors . Unless specified otherwise by the
vehicle manufacturer, assume a 48-pound child is the vehicle LATCH
anchor limit .
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Discontinue use of a child restraint that is older than six years or has
been in a severe crash to prevent injury due to deterioration or hidden
damage .
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This child restraint must not be used in the home, in boats, or other
non-certified applications .
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Based on crash statistics, the National Highway Traffic Safety
Administration recommends that parents select the rear seat as the
safest location for a properly installed child restraint . Please study the
section on Vehicle Safety Belts in this booklet to ensure the child’s
safety . If in doubt about installing the child restraint, consult the
vehicle's owner’s manual .
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Secure this child restraint even when it is not occupied . In a crash, an
unsecured child restraint may injure vehicle occupants .
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When using in vehicle with air bags, refer to the vehicle's owner’s
manual for child restraint installation instructions and precautions .
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Restraint must be in the full upright position when installed in forward-
facing mode with children over 33 pounds (15 kg) .
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Never use the adjuster strap to lift or carry this child restraint . Doing so
could cause damage to the harness adjuster and webbing . Always carry
this child restraint by the shell or tether straps .
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The primary protection for occupants of a vehicle in a collision is the
structure of the vehicle itself; a child restraint will not protect a child
when the vehicle is seriously impacted . However, correctly installed, a
child restraint will substantially improve the chances for survival in most
crashes . Make sure that all users fully understand the correct ways to
use this child restraint in a vehicle .