Maxine Carr - who provided a false alibi for Soham murderer Ian Huntley - has become a mother.
The 34-year-old gave birth to her first child earlier this year.
The former teaching assistant is believed to have married her child's father, who is aware of her past.
She is currently living at a safe house under a secret identity.
An injunction prevents the publication of any details which would reveal Carr's new identity but a new order may be sought to protect the child.
Carr, the girlfriend of Huntley, served 21 months in prison for providing the school caretaker with a false alibi after he murdered Holly Wells and Jessica Chapman, both 10, in Soham, Cambridgeshire, in 2002.
Although not implicated in the murder, she claimed she had been with him at the time of the killings, which delayed the police investigation.
She was convicted of perverting the course of justice and sentenced to three-and-a- half years in prison.
The Daily Mail reported that she has miscarried twice since 2006 after becoming pregnant by different men. She is believed to have married her current partner in 2008.
She is one of four former UK prisoners to be given secret identities, along with child killer Mary Bell and James Bulger's murderers, Robert Thompson and Jon Venables.