A man has been charged with the murder of heavily pregnant Kelly Mary Fauvrell and the manslaughter of her baby son Riley.
Fauvrelle, 26, who was eight months pregnant, was killed in the bedroom of her home in Raymead Avenue, Thornton Heath, London, in the early hours of June 29.
She was fatally stabbed and her baby son, named Riley by family members, was delivered at the scene by paramedics, but died in hospital on July 3.
Aaron McKenzie, 25, of Peckham Park Road, Peckham, was arrested on Thursday and taken to a central London police station.
Scotland Yard said early on Sunday that he had also been charged with one count of possession of an offensive weapon.
The attack took place in Fauvrelle's bedroom while her whole family was at home and relatives heard her screams at around 3.30am.
Two men had previously been arrested on suspicion of murder.
One, aged 37, was released with no further action, and a second, aged 29, has been released on bail until early August.
McKenzie is due to appear in Camberwell Green Magistrates' Court on Monday.