For ISOFIX or i‑Size child restraint systems in which the child is secured using the seat belt integrated in the child restraint system, the permissible gross weight of the child and child restraint system is 33 kg.
If the child and the child restraint system together weigh more than 33 kg, the ISOFIX or i‑Size child restraint system with integrated seat belt does not offer sufficient protection. Too much load may be placed on the ISOFIX or i‑Size child restraint systems and the child may not be restrained correctly in the event of an accident, for example.
in the manufacturer's installation and operating instructions for the child restraint system used
on a label on the child restraint system, if present
Regularly check that the permissible gross mass of the child and child restraint system is still being adhered to.
When using a child restraint system, be sure to observe the manufacturer's installation and operating instructions as well as its correct use and the suitability of the seats for attaching a child restraint system.
Before every trip, make sure that the ISOFIX child restraint system or the i-Size child restraint system is engaged correctly in both ISOFIX or i‑Size mounting brackets.