晚期流产症状有哪些?What does the symptom of late miscarriages have?

　　宫颈松弛表现为妊娠中晚期，胎儿长大，羊水增多，宫腔内压力增加，胎囊向宫颈内口突出，宫颈管逐渐短缩、扩张。患者多无自觉症状，一旦胎膜破裂，胎儿迅即排出。

　　Cervical relaxation is manifested in the middle and late stages of pregnancy. The fetus grows, amniotic fluid increases, the pressure in the uterine cavity increases, the fetal sac protrudes to the cervix, and the cervix tube gradually shrinks and expands. The patient has no conscious symptoms. Once the fetal membrane is ruptured, the fetus is discharged immediately.

　　母婴血型不合是孕妇与胎儿之间因血型不合而产生的同话血型免疫性疾，常见的有ABO血型系统与Rh血型系统，会引起胎儿水肿、黄疸、贫血等晚期流产、早产、新生儿溶血， 在所有妊娠中约有20-25%为ABO血型不合，而真正发生溶血的只有2-2.5‰。

　　The maternal and infant blood type difference is the same blood type immune disease that occurs between the pregnant woman and the fetus due to the blood type difference. The common ABO blood type system and the Rh blood type system can cause late miscarriagess such as fetal edema, jaundice, anemia, premature delivery, and neonatal hemolysis. About 20-25 % of all pregnancies are ABO blood types, and only 2-2 .5 ‰ are actually hemolytic.