Aaron McKenzie, 25, of Peckham, south London, has also been charged with one count of possessing an offensive weapon.
He is due to appear at Camberwell Green Magistrates’ Court on Monday.
Ms Fauvrelle, was eight months’ pregnant when she was stabbed to death in the bedroom of her home in Thornton Heath, south London, in the early hours of 29 June.
The 26-year-old’s baby son – who was named Riley by family members after he was delivered by paramedics – died in hospital on 3 July.
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.