Officials say the 13-month-old victim is the woman's daughter.
Police say Kyle, 46, and the girl's mother are jailed on a $2 million cash-only bond. It wasn't immediately clear if they had attorneys.
According to the San Francisco Chronicle, police found hundreds of images of child porn in Kyle's home computer.
The woman is also charged with incest.
St. Louis County police are not releasing details of the crime but say the infant was rescued from a "horrific" situation.
The 13-month-old victim has been placed under state care and was treated at a hospital, the paper reports.