Having repeated early miscarriages or having one in the first pregnancy is a risk that pregnant women need to know clearly the cause of natural early miscarriages and whether early miscarriages affect future pregnancies.

Uterine inversion is a rare emergency during vaginal delivery in which part or all of the uterus turns inside out, extending beyond the cervix or vagina. This abnormal uterine condition occurs primarily when the umbilical cord is pulled too hard to deliver the placenta.