That is why pregnant women should not drink tea or coffee

For all pregnant women doctors do not recommend that they drink coffee or tea. According to doctors, women who consume tea or coffee during pregnancy are likely to have small babies.

Females who consume less than 200mg caffeine, which corresponds to two cups of coffee or three cups of tea, are more likely to have lower birth or premature newborn weight.

Researchers from the University of Berlin College believe that caffeine limits blood flow in placenta, directly affecting baby growth.

The study, led by Dr. Ling-wei Chen looked at 941 children in Ireland. Tea was the main source of caffeine (48 percent), followed by coffee (38 percent).

The results suggested that for each additional 100mg of caffeine about half a cup of coffee consumed daily during the first quarter, birth weight decreased (72g).

This amount of caffeine has also reduced the baby's length and perimeter, as well as their age of gestation, which measures the length of pregnancy.