A man accused of beating a baby to death has told Newport Crown Court that he does not know how six-week-old Alfie Sullock received his injuries.
Michael Pearce, 32, is giving evidence in his defence.
He told the court: "I didn't harm the baby" and "I didn't notice any bruising on him."
Alfie was the son of Mr Pearce's girlfriend Donna, and died last August after he was left in Mr Pearce's care.
Michael Pearce, from Nelson in Caerphilly county borough, denies murder and manslaughter and the trial continues.
The man accused of murdering a six week old baby from Cardiff had five pints of beer shortly before Alfie Sullock was left in his care, a court heard today.
Michael Pearce told police in interviews he was trying to save Alfie's life by giving him mouth to mouth resuscitation. He said Alfie stopped breathing whilst in his care in August last year.
Mr Pearce denies manslaughter and murder. The trial continues.
A court has heard how a man accused of murdering his girlfriend's six week old baby text her to say she could trust him hours before the baby was taken ill.
Alfie Sullock died in August last year from a blunt trauma injury and bleeding to the brain, the court was told. Michael Pearce denies his murder and manslaughter.
*Nicola Hendy *reports.
A man has gone on trial accused of murdering his girlfriend's six week old son. Little Alfie Sullock, from Fairwater in Cardiff, died last August. Michael Pearce, from Nelson, Caerphilly, denies murder and manslaughter. Richard Morgan reports.