The standard values of fasting blood sugar for pregnant women are 3.1-5.1 mmol/L, 1 hour postprandial blood sugar below 10.0 mmol/L and 2 hours postprandial blood sugar below 8.5 mmol/L. Any of these blood sugar measurements greater than the standard value may be dangerous, and the higher the blood sugar value, the more serious the situation will be, so no specific value can be given. If a pregnant woman’s blood sugar is higher than the normal range for a long time, it will have an impact on her own health and the growth and development of her fetus. For example, blood sugar exceeding 8mmol/L for a long time may cause congenital organ dysfunction of the fetus, and exceeding 10mmol/L may cause serious problems such as malformation of the fetus, which is also not good for the health of pregnant women. If the blood sugar is controlled in normal or maintained in stable condition, there is no major impact on the body. If the blood sugar is poorly controlled, pregnant women are prone to obesity, infection, accelerated diabetic metabolic disorders, and even serious conditions such as diabetic ketoacidosis. It is also easy to increase amniotic fluid, more likely to combine with high blood pressure, and the emergence of huge babies, making the probability of difficult delivery increased. If a pregnant woman’s blood sugar is too high and poorly controlled, the fetus is prone to intrauterine distress, resulting in slow growth and malformation, and the probability of miscarriage and premature birth also increases. When a newborn is separated from the high blood sugar environment of the mother, the high level of insulin in her body will easily induce hypoglycemia in the newborn, and the probability of neonatal respiratory distress syndrome will increase. Pregnant women with elevated blood sugar prefer diet and exercise control. The diet should be balanced and nutritious, with fewer and more frequent meals. Exercise should be moderate, the main purpose is to reduce the excess sugar in the body. If the diet and exercise control is not good, it can also be controlled by medication, choose insulin, actively monitor blood sugar and adjust the dosage of medication in time.