OP- this all AA metal? Might matter.

CK desk states they have zero restrictions on placing a child behind an exit row on AA. Exit row is an exit row; row behind the exit row is NOT an exit row. This is an AA flight, yes? agent did not look at US policy.

We did discuss the possible issue if someone booked a seat there for a child and, unknowingly, shows up with a car seat or 'child restraint device'- this would require re-seating and he attendant stresses. She agreed that such a blanket policy would avoid this, but she reviewed all her policy sources and could find no restrictions nor policy.

I vote HUACA.