They summoned the goddess Yogamaya and had her transfer the fetus within the womb of Devaki for the womb of Rohini (Vasudeva's other wife who lived with her sister Yashoda over the river Yamuna, during the village of cowherds at Gokulam). Hence the kid conceived in one womb was incubated https://digitalasset.sfo2.digitaloceanspaces.com/SouthernCaliforniaSurrogacy/Becoming-A-Surrogate-In-Southern-California.html