Mercedes-Benz EQC Owner's Manual page 60

Weight group 1 (9–18 kg and approx. 9 months to 4 years)
Size class:
D
C
B
B1
A
Equipment: Left/right rear seat
ISO/R2, ISO/R2X IL
ISO/R3 IL (1)
ISO/F2 IUF
ISO/F2X IUF
ISO/F3 IUF
IL Suitable for ISOFIX child restraint systems according to the table in "Overview of the recommended child restraint systems", or if the
vehicle and the seat are listed on the child restraint system manufacturer's vehicle model list.
IUF Suitable for forward-facing ISOFIX child restraint systems of the "Universal" category in this weight group.
(1) When using a child restraint system of size class (ISO/R3), move the front seat to the highest position. Make sure that the seat
backrest of the front seat does not rest against the child restraint system.
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Occupant safety