Transient hypoglycemia will not affect the fetus, but persistent hypoglycemia will cause fetal ischemia and hypoxia and other adverse consequences, which need to be analyzed specifically. 1. Transient hypoglycemia: when pregnant women experience transient hypoglycemia, the body will activate the self-regulation mechanism, stimulate the secretion of adrenaline, promote the decomposition of hepatic glycogen, so that the blood glucose will return to normal level, which will not have any effect on the fetus in general. 2. Persistent hypoglycemia: the nutrition of the fetus comes from the mother, when persistent hypoglycemia occurs in the mother, the oxygen and nutrients obtained by the fetus from the mother’s blood will be reduced abruptly, which will easily cause ischemia and hypoxia of the fetus. Pregnant women who are prone to hypoglycemia should go to the hospital for examination in time, closely monitor the changes of blood sugar, and carry out treatment under the guidance of doctors.