Tesla 3 Owner's Manual page 36

Seating Children Safely in Model 3
Rear Center Seat
Infants and children can occupy the rear center seat using the forward and rear-facing belt-based
child restraint systems
Note: The rear center seat is not equipped with anchor bars to support the installation of
ISOFIX/i-Size child restraint systems.
Note: All weight groups are supported.
Seating and Safety Restraints 35