Pure water does not contain a variety of harmful pollutants, does not contain a variety of pathogenic microorganisms, there are no impurities, for the human body will not have a direct harmful effect, but pure water after filtration, most of the minerals are removed, containing less mineral nutrients, if completely to pure water instead of drinking water, over time will lead to a lack of mineral nutrients in the body, affecting the health of pregnant women This will affect the health of the pregnant woman, and then affect the normal development of the fetus. Pregnant women drink pure water in moderation for the development of the fetus will not cause adverse effects, but a long time completely pure water as a daily drinking water, is not conducive to the health of mother and child, the diet intake of pregnant women during pregnancy, for the development of the fetus is of great significance, if the diet of pregnant women intake of various toxic and harmful substances, too cold or spicy stimulating substances, will cause some adverse effects on the development of the baby.