晚期流产为什么会发生呢?Why can late miscarriages happen?

　　对于宫颈松弛的女性孕中期以后，出于羊水增长，胎儿长大，宫腔内压增大，胎囊可自宫颈内口突出，子宫觥管逐渐缩短扩张，当宫腔内压增大至一定程度，子宫颈更加扩张以致引起宫缩或破膜而流产。多表现为晚期流产及早产。

　　For women with loose cervix, after the middle stage of pregnancy, due to the increase of amniotic fluid, the fetus grows, the intrauterine pressure increases, the fetal sac can protrude from the cervix, and the uterine tube gradually shortens and expands, when the intrauterine pressure increases to a certain extent. The cervix is more dilated so that it causes contractions or rupture and miscarriages. Most of them are advanced miscarriagess and premature births.