(Oregon City, OR)  --  A woman is facing a manslaughter charge in the death of an infant she was babysitting in Oregon City.  Thirty-seven-year-old Sarah Elizabeth Martin has been arrested in the death of seven-month-old Izaak Gillen, who died on April 7th.  Authorities say the child was brought to a hospital the day before, and physicians discovered the baby's skull was fractured.  Bail for Martin is set at a quarter-million dollars.