A man and woman have been arrested by detectives investigating the death of a child.
The boy, from Banbury, Oxfordshire, was admitted to Horton General Hospital on 5 November with injuries but died at John Radcliffe Hospital on Friday.
The man and woman were arrested on suspicion of causing grievous bodily harm and released on bail.
Thames Valley Police said the death was being treated "unexplained" and the investigation was in its early stages.
No-one from John Radcliffe Hospital was available for comment when contacted by the BBC.