In order to protect Krishna from Kansa, Krishna and Yoganidra or YogaMāya were born at the same time from the wombs of Devaki and Yashoda, respectively, and were exchanged by Vasudeva Anakadundubhi. Krishna survived as the foster son of Yashoda.

Who was Yashoda in previous birth?

Yashoda and Nanda Maharaj were Dhara and Drona in their previous birth. Dhara and Drona were asked by Brahma to be born in earth during the time when Lord Narayana had promised to be born. They agreed to be born on earth but asked for a boon.

Did Yashoda know that Krishna was not her son?

Meanwhile, Krishna goes to Yashoda, who cried as she came to know that Krishna is not her son. She sobbed and said to Krishna that she including the people of Vrindavan will miss him.