Amanda Marie Hancock and her partner Stephen Williams Jr claimed that they had fed milk to baby Data several times a day.
However an autopsy showed that the seven-week-old had died of starvation.
Police have now claimed that the couple chose not to feed the infant, instead using Amanda's breast milk to make several pornographic movies.
The 21-year-old mother told Oregon police that she had been charging people with a fetish for breast milk to watch her lactate online.
Meanwhile 26-year-old Williams told police that, while he had noticed that Data had lost weight, he didn’t take the tiny baby to the doctor “because that was Amanda’s responsibility.”
“This was the agreement they had made.”
The couple, who apparently showed an "indifference" to the dying child, have now been arrested on charges of murder by abuse.
Social services have taken the couple's two year old child into care.
Mugshot image via Douglas County Sheriff's Office.