In an affidavit released Wednesday, Plant City detectives said they found Talae Thomas' son Chase Harrison floating dead in her apartment's bathtub last week.
She told them that her baby had died at the hospital shortly after birth and that she knew the child she brought home was the devil because he talked to her. Police say she confessed to drowning the baby Nov. 15 to kill the devil. Her family said she suffered a breakdown four years ago and often had hallucinations.
Thomas is being held without bond at the Hillsborough County Jail on first-degree murder charges.
Police say a 30-year-old Florida woman confessed to killing her 5-week-old son, saying he was the devil.