Mild hypoglycemia in pregnant women may not affect the fetus; severe and persistent hypoglycemia may cause fetal growth and developmental limitation, fetal distress, and miscarriage. Mild hypoglycemia in pregnant women has less effect on the fetus, and clinically, pregnant women are encouraged to eat appropriately to keep their blood glucose stable. However, if severe hypoglycemia persists for a long period of time, it may have a greater impact on the fetus. 1. Fetal growth and development is limited: Since all fetal nutrition comes from the mother, the main energy supply of the fetus also comes from the mother’s blood sugar. If a pregnant woman suffers from hypoglycemia, the blood and oxygen supply to the fetus may be insufficient and the physical development of the fetus may be restricted. 2. Fetal distress: Fetal distress may occur because the fetus cannot get the oxygen it needs. 3. Miscarriage: Pregnant women with hypoglycemia are prone to dizziness, fatigue and other symptoms, and easy to fall, if the fall squeezes the abdomen, it may lead to miscarriage due to the rapid increase of abdominal pressure. Therefore, if a pregnant woman has low blood sugar, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor, improve the relevant examination, clarify the cause of the disease, and symptomatic treatment.