Coroner Michael Rose recorded a verdict of accidental death by drowning at the inquest into the death of Dylan Cecil last August.
He said there was nothing Dylan's parents, Rachel McCollum and Darren Cecil, could have done to prevent this "terrible tragedy." He called it, "a tragic misfortune – a nightmare from which they cannot wake."
He said both parent had tried their very best but he added, "we cannot restrain children, they have a life to live".
More top news
A diving team has been called in to search a lake in Northampton in connection with the murder of a pensioner in 2015.
Labour MP Tristram Hunt has formally stood down from the House of Commons, paving the way for a by-election in Stoke-on-Trent Central.
West Midlands Police are raising awareness of drugs Spice and Mamba after a law change.