Opel ASTRA Owner's Manual page 63

Suitable are restraint systems that
comply with ECE 44-03 or
ECE 44-04. Check local laws and
regulations for mandatory use of child
restraint systems.
Ensure that the child restraint system
to be installed is compatible with the
vehicle type.
Ensure that the mounting location of
the child restraint system within the
vehicle is correct.
Allow children to enter and exit the
vehicle only on the side facing away
from the traffic.
When the child restraint system is not
in use, secure the seat with a seat belt
or remove it from the vehicle.
Note
Do not stick anything on the child
restraint systems and do not cover
them with any other materials.
A child restraint system which has
been subjected to stress in an
accident must be replaced.
Seats, restraints 61