Pregnant women with severe fire may be fetal toxicity, but not necessarily fire is fetal toxicity. The so-called fetal toxicity refers to the pregnant mother’s body has not yet adapted to the physiological changes of the fetus, the body’s metabolic products can not be discharged in a timely manner, in the body of the stagnation, which leads to pregnant women appear on the fire. However, there are many other reasons for pregnant women to have serious fire, such as spicy and stimulating food, emotional fluctuations during pregnancy, as well as cold and wind, can lead to fire. Fetal toxicity generally has little effect on the pregnant woman, but it has a greater impact on the fetus. If fetal toxicity is not detoxified in time during pregnancy, the baby will be more prone to fire, constipation, crying and skin eczema after birth. Pregnant mothers are advised to maintain a regular work schedule, avoid smoking, drinking and staying up late, and avoid high-calorie and spicy greasy foods. At the same time, moderate exercise in mid-pregnancy, such as walking, swimming, maternity yoga, etc., to ensure the timely discharge of fetal toxins, to avoid the impact on the fetus.