A developing human takes about thirty-eight weeks to grow and be born. Normally, this occurs about forty weeks after the mother's last
An abortion takes place when the embryo/fetus is too young and small to survive without its mother. When an abortion occurs
In both types of abortion, the embryo or fetus usually comes out of the
Different countries have different laws regarding induced abortion. While abortion is illegal in many countries, there are often exceptions that permit it in cases such as
People speak of spontaneous abortion or miscarriage when the embryo or fetus is lost due to natural causes before the 20th week of pregnancy. A pregnancy that ends this way, but that is between 20 and 37 weeks old is known as "
Spontaneous abortions (miscarriages) are common. About fifteen percent of pregnancies end in spontaneous abortion. In many cases, the woman is not even aware she was pregnant. The pregnancy is only a few days or weeks old and the woman believes the miscarriage is just her
Most miscarriages occur very early. Between ten and fifty percent of pregnancies end with a miscarriage, where the mother or the doctors are aware of it. These figures depend on the age and health of the pregnant woman. Most spontaneous abortions occur so early in the pregnancy that the woman is not even aware that she was pregnant. One particular study showed that 61.9% of pregnancies end in miscarriage before 12 weeks. In 91.7% of these miscarriages, the woman did not know she was pregnant.
The risk of spontaneous abortion decreases sharply after the 10th week of pregnancy, with a loss rate between 8.5 weeks LMP and birth of about two percent; pregnancy loss is “virtually complete by the end of the embryonic period."
Those people who have already had several spontaneous or induced abortions run a greater risk of having a spontaneous one. Those with certain diseases, and those over the age 35 also run a greater risk. Other causes for abortions can be the infection of either the woman or embryo/fetus, or their immune response. Certain diseases or an accidental
Most miscarriages are due to problems with the copying of
Most embryos and fetuses with chromosome problems will not live for a long time. They die very early. There are a few chromosome problems that babies can sometimes be born with. For example,
The most common
Usually, no treatment is needed for a miscarriage. However, sometimes some pregnancy tissue remains in the womb after the miscarriage and must be removed. Sometimes