In this week's podcast, editor Sally Hargreaves talks to the author of a Research Article published early online on sudden unexplained death in infants (SUDI). Although sudden infant death remains one of the most common presentations of post-neonatal infant death in the UK, there still remain numerous theories about its cause. Dr Neil Sebire from the Great Ormond Street Hospital for Children, London, UK, discusses with Sally key findings and implications of the study. Researchers found high levels of Staphylococcus aureus and Escherichia coli bacteria in post-mortem samples from unexplained cases of SUDI, suggesting that these bacteria could be associated with the condition.