When are miscarriages most likely to happen?

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  A Dr. Michael Roizen, MD , Internal Medicine, answered

  

  About 80 percent of miscarriages (also called spontaneous abortions) occur during the first 12 weeks of pregnancy, and half of those are caused by chromosomal abnormalities that are incompatible with a live birth. The risk of miscarriage increases with the number of previous births as well as both maternal and paternal age: A quarter of miscarriages happen in women older than 40.

  

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  A Dr. Kevin W. Windom, MD , OBGYN (Obstetrics & Gynecology), answered

  90% of miscarriages happen in the first trimester. 
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