High blood sugar may cause fetal hypoxia. High blood sugar may cause damage to the blood vessel wall, thus affecting the blood supply and oxygen supply to the fetus, which may lead to fetal hypoxia. Meanwhile, high blood sugar may cause the fetus to stop developing in the early stage of pregnancy, resulting in miscarriage and fetal deformities and other serious conditions. In the late stage of blood sugar is too high, pregnant women are in the state of excess nutrition, easy to lead to the emergence of huge children, and excess nutrition, may cause the amniotic fluid increased, leading to fetal distress in the uterus, resulting in preterm delivery of the situation, these are extremely dangerous situation. Therefore, once you are diagnosed with high blood sugar during pregnancy, you need to control your blood sugar in a timely manner to keep it within the normal range, so as to avoid symptoms that may affect the pregnant woman’s body as well as the normal development of the fetus.