Pregnant women who drink two or more cups of coffee a day double their risk of a miscarriage.
Anywhere from 15 to 18 studies have found a link between caffeine use during pregnancy and miscarriage. The new study examined over 1,000 pregnant women who maintained a relatively constant caffeine consumption during pregnancy.
More than 200 milligrams of caffeine per day significantly increased their risk of miscarriage.
* Reuters January 21, 2008