Abel-Jax Mailey died two days after being found unresponsive at a property on Piccadilly Road, Burnley, on 28 November 2021, Lancashire Police said.
A post-mortem examination, along with further tests, found Abel-Jax died of a head injury, the force said.
Oliver Mailey, 26, of Bowness Road, Burnley, has been charged with murder and is due to appear at Blackburn Magistrates' Court on Wednesday.
A force spokesman said a woman who was previously arrested on suspicion of murder has been released and will face no further action.
LONDON DAILY ARCHIVE
Burnley father charged with murdering seven-week-old baby son
A man has been charged with murder over the death of his seven-week-old son.
12 July 2022 · 21:48 UTC
