Miscarriage or spontaneous abortion in the first three months of pregnancy is generally caused by a chromosomal abnormality. This means that the embryo is not yet well-formed, the product of conception stops from its evolution and is eliminated. Of all the abortions that occur before the 8th week, 30% have no fetus associated with the amniotic sac and placenta.
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Originally posted 2011-10-27 19:18:09.