At what weight limit should I stop using LATCH and switch to a seat belt for forward-facing installation?
You must not use the Lower Anchor Connectors (LATCH) when restraining a child who weighs more than 20.4 kg (45 lbs) with the internal harness. For children over 20.4 kg (45 lbs), you must install the child restraint using the vehicle seat belt instead. (Page 13)
From the official Evenflo Symphony All In One Car Seat manual, page 13
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