Daphne Spurlock, 45, told Magnolia, Texas police she slashed her sons throat because "he was infested with demons."
On Saturday night Spurlock stomped on her son's head and chest before slitting his throat.
The child's father came home from work to find Spurlock standing over the child.
Child Protective Services said it has no history with the family and there are no other children who live in the home.
The young boy was air-lifted to Memorial Hermann Hospital after his father called 911.
His mother has confessed and is in Montgomery County Jail on attempted capital murder charges.