What is the proper weight range for booster mode use?
For high back booster mode with a vehicle lap/shoulder seat belt, children should weigh 30-100 lb (14-45 kg). For backless booster mode, children should weigh 40-100 lb (18.1-45 kg). Children over 65 lb (30 kg) must be in booster mode.
From the official Graco Tranzitions Car Seat manual, page 42
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