A six-month-old baby who died the "victim of Sudden Infant Death Syndrome" an inquest at Douglas Court House has heard.
Coroner Jayne Hughes said nothing could have been done to save Kai Robson from Bucks Road in Douglas, the Isle of Man.
The inquest heard how the baby boy was discovered by his mother on the bedroom floor on 17 December 2013.
Chelsea Robson, 18, called the ambulance immediately, but said she knew her child was already dead.
A subsequent post-mortem examination, conducted at Alder Hey Hospital in the UK, failed to reveal any pathological reason for the death.
"Kai was a happy, healthy and well-cared for child," said Mrs Hughes.
"There was no evidence of injuries - I am satisfied that Kai was the very sad and tragic victim of natural causes, namely Infant Death Syndrome, nothing could have been done to save his life."