Tesla Y Owner's Manual page 38

Child Safety Seats
In the second row, install LATCH child safety seats in the
outboard seating positions only. Use only a seat belt
retained seat in the center position.
To install a LATCH child safety seat, slide the safety seat
latches onto the anchor bars until they click into place.
Carefully read and follow the instructions provided by
the child safety seat manufacturer.
NOTE: Lower LATCH anchors should not be used with
child seats or booster seats that have an integrated
safety belt in situations where the combined weight of
the child plus the child restraint is more than 65 lbs (29.5
kg). In these situations, use the safety belt instead.
NOTE: If Model Y is equipped with seven seats, the third
row seating positions are not equipped with LATCH
anchors. Use only seat belt retained child safety seats in
a third row seating position.
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Once installed, test the security of the installation before
seating a child. Attempt to twist the child safety seat
from side to side and try to pull it away from the seat,
then check to ensure the anchors remain securely in
place.
Attaching Upper Tether Straps
If an upper tether strap is provided, attach its hook to
the anchor point located behind the seat.
NOTE: The location of anchor points may not be readily
visible but can be found by identifying a slice in the
seat's material.
WARNING: Tighten upper tether straps according
to the instructions provided by the manufacturer
of the child safety seat.
WARNING: USE ONLY SEAT BELT RETAINED
CHILD SAFETY SEATS IN THE CENTER SEATING
POSITION.
Make sure the hook is fully seated on the anchor point.
MODEL Y Owner's Manual