Chromosomal abnormalities are the most common reason why women have miscarriage early on in pregnancy. This can still be the reason somebody suffers a later pregnancy loss, but much less frequently. Birth defects like heart problems are seen more often in late miscarriages, and infections, abdominal injury, or placental problems like a malfunctioning placenta or a placenta that detaches from the uterine wall are also among the most frequent causes of second trimester miscarriages. In addition there is the possibility that the cervix will not remain closed the way it should be, thereby triggering early labor. If this is diagnosed in time, it is possible to place a cerclage, a stitch in the cervix to keep it shut until term is reached.
If you have already had a late miscarriage before, you may want to get checked for this. As much as 20 percent of all pregnancies ends in miscarriage. The real figure may be closer to 50 percent if we count very early miscarriages, often before a woman knows she is pregnant. If you have suffered a later loss, you have every reason to be concerned and you may want to request fetal testing to figure out what the cause behind the miscarriage is. Talk to your doctor about this as soon as possible, even before medical check-ups after a miscarriage, and also discuss your history of loss if you are pregnant again. That does not mean you will not be able to have a healthy baby later on most women who have a miscarriage are able to get pregnant again, and the causes of miscarriage are often related to that individual pregnancy.