The Frontier Nursing Service grew rapidly during its first five years. With the help of two nurses, Edna Rockstroh and Freda Caffin, Breckinridge opened the group's first clinic in Hyden, Kentucky in 1925. The demand for the clinic grew rapidly, and within the first month of operation, Breckinridge and two nurse-midwives served 233 patients.
The Frontier Nursing Service expanded rapidly during its initial five years.  Edna Rockstroh and Freda Caffin assisted founder Breckinridge in opening the group's first clinic in Hyden, Kentucky in 1925. The demand for the clinic increased quickly, with Breckinridge and two nurse-midwives serving 233 patients within the first month of operation.