In December 1991 a British government campaign was launched to help prevent the sudden unexpected deaths of apparently healthy babies. The incidences of Sudden Infant Death Syndrome (SIDS), at the time often referred to as 'cot death', had been increasing across the western world for decades. Claire Bowes has been speaking to Professor Peter Fleming, the doctor who found out why.Photo: BBC - A father cradles the feet of his 5 day old baby girl.