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.
More top news
The discovery was made at an address on Steve Newton Avenue, the woman's death is being treated as unexplained.
A Scarborough man convicted of a child sex offence has been jailed today.
It will be feeling bitterly cold by the weekend and into next week. Find out more with Kerrie.