It is said that when she crossed the ocean, she tied stones called Tsukinobe ishi and Chinkai seki around her abdomen with bleached cotton to delay the birth of her child by cooling her abdomen.
渡海の際は、お腹に月延石や鎮懐石と呼ばれる石をあててさらしを巻き、冷やすことによって出産を遅らせたとされる。