Volvo 2008 V70 Owner's Manual page 37

Use this booster cushion only with children whose weight is between:
Stage 1: 48-80 lbs (22-36 kg)
Stage 2: 33-55 lbs 15-25 kg
and whose height is between:
Stage 1: 45-55 in. (115 -140 cm)
Stage 2: 37-47 in. (95 -120 cm)
In Canada, Transport Canada's weight recommendation is 40-80 lbs (18-36 kg).
1
Canada only: This cushion may be referred to as a built-in booster cushion.
The booster cushion is designed to raise the child higher, so that the shoulder strap crosses over the child's collarbone,
not over the child's neck. If using a booster cushion does not result in proper positioning of the shoulder strap, then the
child should be placed in a properly secured child restraint (see the information beginning on
belt must never be placed behind the child's back or under the arm.
Before driving, check that:
The integrated two-stage booster cushion is set in the correct position for according to the child's height and weight
(see the table below) and is locked in position.
page 34). The shoulder