The jury at the inquest into the death of a baby boy from Accrington has ruled he died from natural causes.
Four-month-old Toby Woods died at his home in September 1999. His mother Donna Hanson was questioned by police but no charges were ever bought.
She wept as the coroner read out the verdict at the hearing at Clitheroe Town Hall.
The jury returned a verdict of an "unexpected sudden death of an infant" on Friday.
Ms Hanson's lawyers had argued that she was never to blame and her son had been seriously ill.
The jury returned a verdict of an "unexpected sudden death of an infant".
The coroner, Michael Singleton, then ruled Toby Woods died from natural causes.
In December 1998 Toby's 10-month-old brother Ashley died.
A coroner subsequently ruled he died from natural causes.
A police investigation into the deaths of both babies concluded in July 2000, without a prosecution.