Seat Leon 2010 Owner's Manual page 52

50 Child safety
WARNING
•
The shoulder part of the seat belt must lie approximately on the centre
of the shoulder, never across the neck or the arm. The seat belt must lie
close to the upper part of the body. The lap belt part must lie across the
pelvis, not across the stomach, and always fit closely. Pull the belt tight if
necessary to take up any slack ⇒ page 24, "Seat belts".
•
Read and always observe information and warnings concerning the use
of child seats ⇒ page 47.