The coroner has indicated she is likely to give a narrative verdict on the death of seven-week-old Axel Peanberg King.
Dr Shirley Radcliffe told the inquest that she had been unable to find any evidence to suggest a "clear cause" of death.
More top news
Dry and cloudy tonight, winds easing. Lows of 9C.
England rugby star Danny Cipriani has been arrested on suspicion of drink driving following a car crash.
The desirable Bentley 4 and a half litre was built in 1929 and, six years later, was bought by the grandfather of the current owner.