The becky is alleged to have raped her newborn daughter repeatedly at her home in Port Charlotte County until she was arrested in 2009.
Her boyfriend, Glenn Nelson, is currently in prison after accepting a plea deal over the rape charges.
In a TV interview with NBC2 from inside the jail, Nelson admitted they had both fantasised and talked about having sex with a baby but denied harming the child.
‘It’s all in there all the time about fantasies,’ he argued. ‘Not reality that was happening. It was fantasising and talking about it.’
After their capture, Charlotte County deputies said it was one of the worst cases they had ever investigated.
‘They’d been having sex with this baby, both of them, since the child was born,’ Bob Carpenter of the sheriff’s office said at the time.
Investigators confiscated computers from the couple’s homes and Nelson’s office. Detectives said they found child pornography images and chat files between Bailey and Nelson discussing having sex with her baby over webcam, local reports noted at the time.
Jurors picked for the trial were warned they may see graphic images and videos.
Lawyers for Bailey plan to use an insanity defence, but doctors have ruled she is fit to stand trial.
The divorced becky faces charges of sexual battery on a person under the age of twelve, lewd and lascivious molestation, lewd and lascivious exhibition, possession of child pornography and use of child in sexual performance.
It is believed her trial will last until Thursday or Friday.
Bailey had been offered a plea deal by the state, but decided to plead not guilty and proceed with a trial. If found guilty, she faces life behind bars.
The victim, now aged four, lives with her father.