A new study suggests that consuming caffeine during pregnancy may increase the risk of miscarriage.
The study finds that women who consume more than 200 milligrams of caffeine a day (amount in 10 oz of coffee) may double their risk of miscarriage. The study included 1,063 pregnant women who were interviewed about their caffeine intake. Of the 264 who said they had no caffeine, 12.5% miscarried. In the 164 who consumed 200 milligrams or more per day, the rate of miscarriage was 24.5%.
While there is no clear cut way to prevent a miscarriage, it does indicate that caffeine does have adverse affects and at minimum should be limited during pregnancy.
Natural families and lifestyle 
It’s not only caffeine, there are many other foods which can lead to problem of ur unborn child. Precaution is the best cure.