Objective; To monitor the first ovulation,uterine involution and alteration of ovary in post-partum women,and to provide science data for contraception in postpartum lactating women.

• 观察产后哺乳妇女首次排卵日,了解产后哺乳妇女卵巢变化及子宫体复旧情况,为产后哺乳妇女避孕节育措施的应用提供科学数据。