They summoned the goddess Yogamaya and experienced her transfer the fetus in the womb of Devaki on the womb of Rohini (Vasudeva's other spouse who lived with her sister Yashoda over the river Yamuna, in the village of cowherds at Gokulam). As a result the child conceived in one womb https://digitalasset.sfo2.digitaloceanspaces.com/SouthernCaliforniaSurrogacy/Becoming-A-Surrogate-In-Southern-California.html