Fetal mild hypoxia in late pregnancy usually does not affect intelligence, severe hypoxia may affect intelligence. Fetal hypoxia in late pregnancy due to placental dysfunction, umbilical cord around the neck, umbilical cord knot, gestational hypertension and other reasons may lead to intrauterine oxygen deprivation, just a slight hypoxia can be treated with oxygen inhalation, so that the fetus ingests enough oxygen, and the impact on the intelligence of the fetus is not too great. Fetal severe hypoxia in late pregnancy, the placenta can not deliver enough oxygen to the fetus, over time so that the fetal brain development is incomplete resulting in mental retardation, which will have an impact on fetal intelligence, and in severe cases may lead to fetal asphyxia, stillbirth and other conditions. Fetal hypoxia in late pregnancy may show abnormal fetal movement, at first may be frequent fetal movement, and later manifested as a decrease in fetal movement, through the fetal heart rate monitoring examination may not pass, notice the abnormalities should be timely oxygen or termination of pregnancy treatment.