Correct answer
Height and weight as applicable to the seat’s approval.
The child’s height and, according to approval and limits, weight; vehicle compatibility and correct installation also matter. R129 primarily classifies by height; existing R44 seats use weight groups. Follow seat limits and instructions rather than age or comfort alone. Approval and suitable selection help protect but cannot guarantee preventing every injury.
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Height and weight as applicable to the seat’s approval.
The available vehicle seat alone, ignoring the child’s size.
Comfort alone, without checking approval or limits.
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