FORD 2013 Expedition v.1 - Manual (Page 28)

however the safety belt can still be used to attach the child seat. For
forward-facing child seats, the top tether strap must also be attached to
the proper top tether anchor, if a top tether strap has been provided
with your child seat. Ford Motor Company recommends the use of a
child safety seat having a top tether strap. See Using Tether Straps in
this chapter.
Your vehicle has LATCH lower anchors for child seat installation at the
seating positions marked with the child seat symbol.
The LATCH anchors are located at the rear section of the rear seat
between the cushion and seatback, below the locator symbols on the seat
back. Follow the child seat manufacturer’s instructions to properly install
a child seat with LATCH attachments.
The locator symbols are on round plastic buttons for the center seat and
on rectangular tags for the outboard seats.
28 Child Safety
2013 Expedition (exd)
Owners Guide gf, 1st Printing
USA (fus)