Insufficient sanitary conditions: in ancient times, women's production depended more on a stable woman, and poor families might not even be able to support a stable woman; When giving birth, we can only rely on the maternal's own strength to give birth naturally, coupled with insufficient sanitary conditions, which is likely to leave lifelong diseases during or after delivery. There are also many cases of postpartum infection and death in a short time in history. For example, the famous genius Nalan's original match Lu died of a cold after giving birth to a child. Nalan Xingde's most famous eulogy is about his dead wife.