A woman pleaded guilty to causing the death of her 15-month-old son, whose severe diaper rash led to a fatal infection.

Amy Livingston (search), 27, pleaded guilty to involuntary manslaughter in the boy's death and to child endangerment for not treating the rash on another son.

Her son, Harley, died in December of sepsis and dehydration. His brother, Hunter, 4, was successfully treated.

Doctors testified at the mother's preliminary hearing that the baby could have survived with basic care, prosecutor Trysh Sutton (search) said.

Livingston's mother is awaiting trial on a child endangerment charge alleging that as a day-care provider, she failed to report suspected neglect or abuse of the two boys.

Judge F. Joseph Leahey (search) said prosecutors have not recommended a penalty for Livingston, who is scheduled to be sentenced Aug. 30.