PURPORT

Kamsa tried to dash the child downward against a piece of stone, but since she was Yogamaya, the younger sister of Lord Visnu, she slipped upward and assumed the form of the goddess Durga. The word anuja, meaning "the younger sister," is significant. When Visnu, or Krsna, took birth from Devaki, He must have simultaneously taken birth from Yasoda also. Otherwise how could Yogamaya have been anuja, the Lord's younger sister?