Karen Foster, of no fixed address, will appear before Blackburn Magistrates' Court this morning, Lancashire Police said.

Foster is not related to either of the two victims and the two children are not related to one another, according to the force.

Police were called on 1 March last year to an address in Hapton, Lancashire, following reports a baby boy had suffered a medical episode.

The boy, aged nine-and-a-half months, was taken to hospital for treatment but died on 5 March.

A 60-year-old woman from Haslingden and a 78-year-old man from Burnley were arrested on suspicion of assault and were subsequently detained on suspicion of murder.

The 78-year-old man has now been released without charge, while the woman has been charged with the baby's murder.

Foster is also charged with a separate S47 assault on a one-year-old girl in Hapton on 22 March 2019.