While I was researching miscarraige on the net I found this article from 22 January 2008 on NHS.uk/news which i thought may be useful to some of you. This may be why so many pregnant women go off coffee & tea
Drinking coffee can double the risk of miscarriage reported The Guardian and many other news sources yesterday. Pregnant women who consumed two or more mugs of coffee a day were twice as likely to miscarry than those who abstained from caffeine, The Guardian said. The media coverage suggested that pregnant women may wish to reduce or stop drinking drinks containing caffeine, including coffee and tea.
The newspaper story is based on a study in 1,063 pregnant women in San Francisco. The study found that women who drank more than 200mg or more of caffeine a day the amount contained in two or more regular cups of coffee or five 12oz (330 ml) cans of caffeinated drink doubled their risk of miscarriage compared with women who drank no caffeine. However, this study has some limitations, including difficulty in making sure that the results are not affected by other factors that are known to increase the risk of a miscarriage.
Overall, the advice that pregnant women should avoid drinking too many drinks containing high levels of caffeine while they are pregnant seems sensible. Currently in the UK, the Food Standards Agency recommends that women limit their caffeine intake during pregnancy to 300mg a day.