They summoned the goddess Yogamaya and experienced her transfer the fetus in the womb of Devaki for the womb of Rohini (Vasudeva's other spouse who lived with her sister Yashoda across the river Yamuna, from the village of cowherds at Gokulam). Hence the kid conceived in one womb was incubated https://digitalasset.b-cdn.net/SouthernCaliforniaSurrogacy/Becoming-A-Surrogate-In-Southern-California.html