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Pregnancy after miscarriage: What you need to know

What causes miscarriage?

Miscarriage is the spontaneous loss of a pregnancy before the 20th week. Many miscarriages occur because the fetus isn't developing normally. Problems with the baby's chromosomes are responsible for about 50 percent of early pregnancy loss. Most of these chromosome problems occur by chance as the embryo divides and grows, although it becomes more common as women age. Sometimes a health condition, such as poorly controlled diabetes or a uterine problem, might lead to miscarriage. Often, however, the cause of miscarriage isn't known.

About 8 to 20 percent of known pregnancies end in miscarriage. The total number of actual miscarriages is probably higher because many women miscarry before they even know that they're pregnant.