The fact that menstruation stops after 10 months postpartum is considered to be caused by normal physiological phenomenon, pregnancy, endocrine dysfunction and other factors. 1. Physiological phenomenon: If a woman is breastfeeding 10 months after giving birth, her endocrine function has not fully recovered, and she may experience the symptom of having one period and then stopping it, which is a normal phenomenon, and her menstrual cycle will return to normal after she stops breastfeeding. 2. Pregnancy: If a woman is pregnant 10 months after delivery, she may have the symptom of stopping menstruation again, usually accompanied by other early pregnancy reactions, such as morning sickness, picky eating and so on, which can be clearly diagnosed by HCG test. 3. Endocrine dysfunction: If you are tired for a long time or have an irregular diet in the 10 months after delivery, it will easily lead to endocrine dysfunction, and the symptoms of irregular menstruation will also appear, and there will be the symptom of menstruation once and then stop. If the menstrual period stops after 10 months, it is recommended to consult a doctor to clarify the cause of the problem and standardize the treatment.