Eli Cox death: Danny Shepherd interviewed by police
Danny Shepherd demonstrated to Kent Police during questioning how he had carried out chest compressions on Eli Cox after the baby collapsed at their Kent home in April last year.
Mr Shepherd is accused with Eli's mother Katherine Cox of causing the death of the five-month-old infant.
The video was played to the jury at the pair's trial at Maidstone Crown Court.
They both deny the charges.