Most tea leaves contain tea polyphenols, aromatic oils, minerals, protein, vitamins and other nutrients. Regular drinking can promote fluid production to quench thirst, reduce fat and lose weight, which is beneficial to human body. However, the constitution of pregnant women is special, and a little carelessness will have some influence on the growth and development of the fetus.

Caffeine content is high.

Tea contains 2%-5% caffeine. Drinking a lot of strong tea, especially black tea, will have a certain exciting effect on the human body, thus stimulating the increase of fetal movement, and may even affect the development of the fetus and reduce its weight.

Tannic acid affects iron absorption.

Tea also contains tannic acid, theophylline, caffeine and other substances, especially tannic acid, which can also combine with iron ingested by pregnant women to form compounds that cannot be absorbed by the human body and hinder the absorption of iron by pregnant women.