Not so fast! This study looked at the miscarriage rate, but the opposite conclusion has been drawn in other studies of the developing fetus. There's new evidence from Yale Univ. that caffeine consumed during pregnancy is harmful to formation of the heart and growth of the child:

http://www.sciencedaily.com/releases/2008/12/081216133440.htm

and

http://www.sciencedaily.com/releases/2008/11/081103102125.htm