During pregnancy, the hyperglycemic state of pregnant women can affect the development of the fetus and needs to be taken seriously by the majority of women during pregnancy. The hyperglycemic state of pregnant women will have the following effects on the fetus: 1, diabetes during pregnancy is prone to excessive amniotic fluid, excessive amniotic fluid has the possibility of premature rupture of the fetal membranes, premature birth, etc.. 2. Diabetic ketoacidosis is likely to occur during pregnancy, and once it occurs, it is critical and can cause fetal death. 3.There is a possibility of huge baby or intrauterine growth retardation, intrauterine distress and fetal death. 4. The incidence of fetal malformations during gestational diabetes is higher than that of non-diabetic pregnant women, and the fetus is prone to cardiovascular system malformations. 5, the fetal lung maturity of diabetic pregnant women is delayed, the newborn is prone to neonatal respiratory distress syndrome, which needs to be sent to the neonatal ward for resuscitation treatment, which is costly and does not guarantee the prognosis, and in serious cases endangers the life of the newborn, with the possibility of death. 6, gestational diabetes fetus after birth, there is a possibility of neonatal hypoglycemia, if not given in time to supplement the sugar, in serious cases endanger the life of the newborn. In summary, gestational diabetes has a great impact on the fetus, so it is recommended that pregnant women regularly monitor changes in blood sugar during pregnancy and treat elevated blood sugar in a timely manner.