Subaru BRZ 2018 Owner's Manual page 144

1-7. Safety information
Forward facing
Booster seat
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Selecting an appropriate child restraint system
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Use a child restraint system appropriate for the child until the child
becomes large enough to properly wear the vehicle's seatbelt.
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If a child is too large for a child restraint system, sit the child on a rear
seat and use the vehicle's seatbelt. ( P. 60)
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Where to place a child restraint system
The following are SUBARU's recommendations on where to place a child
restraint system in your vehicle.
142
Convertible seat
Front passenger's seat
Rear seat seating positions