Pregnant women with high blood glucose does not necessarily have an impact on the fetus, high blood glucose control in a stable situation does not have a significant impact on the fetus, high blood glucose can not be effectively controlled, may cause impact on fetal growth and development, intrauterine distress of the fetus, increase the chances of gestational hypertension. 1. Little impact: pregnant women with high blood sugar but through dietary control, exercise, insulin and other ways of regulating blood sugar can be controlled in a stable state, the impact on the development of pregnant women themselves and the fetus is not significant. 2. Impact on growth and development: pregnant women with high blood sugar can not be controlled in the normal range, time will affect the normal growth and development of the fetus, early pregnancy may increase the chances of fetal malformation, miscarriage. Excessive growth of the fetus in the state of high blood sugar may result in giant children, excessive amniotic fluid, increasing some of the burden on the mother’s vital organs. 3. Intrauterine distress: prolonged elevation of blood glucose will stimulate the proliferation of placental capillaries, leading to insufficient perfusion of the placenta, and fetal distress may occur in the middle and late stages of pregnancy. 4. Hypertension during pregnancy: Pregnant women with prolonged high blood sugar can increase blood viscosity, which can cause vascular contraction and increase the incidence of hypertension during pregnancy. Pregnant women with high blood sugar should seek medical treatment and control in time to minimize the impact on fetal growth and development.