The First Years B540 - Manual (Page 14)

Section 7 - Installation and Use
3 . Place child in Booster Seat.
- Child MUST sit upright with back
contacting seat back, NOT slouching
or sliding down.
4 . Adjust headrest so that the top of
shoulder belt guides are at or just
above child’s shoulders.
- Push yellow headrest handles in
and move headrest up or down to
desired position.
- Release headrest handles
and make sure handles
snap into locked position.
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