Mercedes-Benz R-Class Owner's Manual page 55

Safety
Occupant safety
Weight categories and Child restraint system
ages on the front-
passenger seat
Group I: 9 to 18 kg;
As recommended
between approx. 8 months
and 4 years
Group II/III: 15 to 36 kg; Not suitable
between approx. 3½ and
12 years
If you are using a child restraint system without automatic child seat recognition, move the front-passenger seat to its rearmost position.
16
15 Position the rear seat backrest vertically.
52
2nd row of seats:
child restraint sys-
tem on the left-hand
and right-hand seats
16 15
Universal
15
Universal
2nd row of seats: child
3rd row of seats*: child
restraint system on
restraint system
the centre rear seat
As recommended Universal
As recommended Universal
* optional