《黄帝内经·素问·六元正纪大论》
人们感到凄惨，若寒风骤至，则土气不胜，脾不得长养，此时妊娠多流产。
民乃惨凄，寒风以至，反者孕乃死。
People feel miserable. If the cold wind comes suddenly, the earth qi will be defeated, and the spleen will not be able to grow. At this time, pregnancy often miscarries.