Pregnant women who drink a small amount of tea has no effect on the fetus, but if you often drink tea, it will affect the growth and development of the fetus. The main reason is that tea contains tannic acid, which can tannin the nutrients absorbed by pregnant women, such as calcium, iron, etc., so that the stock of these trace elements in the body is very small, with urine out of the body, through the pregnant woman to the fetus will reduce the nutrition, affecting the growth and development of the fetus. So pregnant women drink tea, if a lot of tea will affect the growth and development of the fetus, a small amount of tea is not affected. In addition, if you supplement calcium tablets, iron tablets during pregnancy, you must refrain from drinking tea.