B727 FO REFLECTS ON COCKPIT COORD BREAKDOWN BTWN FLT ATTENDANT; SO; AND CAPT WITH PAX SEAT MOVEMENT WHILE ACFT WAS UNDER TAXI.

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THIS IS A RPT BASED ON THE CAPT'S SUBMISSION WITH MY COMMENTS AT THE END. ON TAXI OUT AT DCA; FLT ATTENDANT DISCOVERED A 12 YR OLD IN AN EXIT ROW AND CALLED THE SO TO ASK IF HE SHOULD BE MOVED. THE FO AND I WERE ENGAGED IN RADIO CONVERSATION WITH GND CTL ABOUT CLRING THE TXWY FOR A JET THAT WAS EXITING THE RWY. THERE WAS ANOTHER JET ON SHORT FINAL; SO TIME WAS CRITICAL. DURING THIS TIME; THE SO TOLD ME ABOUT THE EXIT ROW SIT AND ASKED ABOUT MOVING THE CHILD. I SAID 'YES' BUT INTENDED TO HAVE IT DONE WHEN I COULD COORD A PLACE TO STOP. THIS FAILURE TO COM MY COMPLETE INTENTIONS TO THE SO RESULTED IN THE PAX BEING MOVED WHILE THE ACFT WAS MOVING. DURING THIS TIME; I WAS DISTR AND ABSORBED IN THE TAXI SIT AND THIS CAUSED THE FAILURE TO COM. AS THE FO; I WAS ABSORBED WITH ATC COMS AND THE TXWY SIT. I SHOULD HAVE ADVOCATED CLRING THE CONGESTED AREA AND TELLING ATC THAT WE NEEDED A PLACE TO STOP SO THAT WE COULD MOVE THE PAX. I BELIEVE THAT THIS WOULD HAVE HELPED THE CAPT TO BE MORE CLR IN HIS INTENTIONS.