《北史·列传·卷三十一》
勾践在小小的越国还立有赏法：女子生三个儿子的，公家给她雇乳母。
句践以区区之越，赏法：生三男者给乳母。
Goujian also established reward laws in the small state of Yue: the government would hire wet nurses for women who gave birth to three sons.