Gestational diabetes refers to hyperglycemia that starts or is first identified during pregnancy, including previously undiagnosed glucose intolerance and diabetes before pregnancy. Although most patients’ blood sugar levels may return to normal after delivery, whether or not it normalizes postpartum, it is considered gestational diabetes. The harm during pregnancy endangers the health of both the fetus and the mother. The effects on offspring mainly manifest in the following ways: First, it increases the risk of complications such as fetal intrauterine death and congenital anomalies. Second, the risk of giving birth to a large baby is increased. Third, the incidence of neonatal hypoglycemia, jaundice, polycythemia, and hypocalcemia increases. Fourth, the risk of obesity, glucose intolerance, and diabetes increases during adolescence and young adulthood. Therefore, while gestational diabetes is not inherited by the baby, it does increase the risk of obesity, glucose intolerance, and diabetes in the baby during adolescence or young adulthood.