The child was taken to Airedale General Hospital by ambulance where he was pronounced dead.
A murder investigation was launched by West Yorkshire Police's Homicide and Major Enquiry Team and at 11:30am this morning and a 32-year old man was arrested from an address in the Ingrow area of Keighley.
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Mrs Maguire, a schoolteacher in Leeds, was stabbed seven times by pupil Will Cornick in April 2014, and died in hospital later.
Motorists are being asked to avoid areas of Craven due to heavy flooding.
Police are trying to reach out to the mother of a newborn baby who was found in a carrier bag in Leeds a year ago today.