The fetus may be larger than the gestational week if the pregnant woman has irregular menstruation before pregnancy, the fertilized egg is laid early and the gestational week is incorrectly projected, which is usually not obviously harmful and requires regular maternity checkups combined with ultrasound results to deduce the correct gestational week. If the gestational week is correctly calculated, the probability of difficult labor during delivery will increase when the ultrasound shows that the fetus is larger than the gestational week. A fetus larger than the gestational week in early pregnancy, often due to high blood sugar levels, increases the probability of fetal limb skeletal dysplasia, malformations, intrauterine distress, and also increases the risk of miscarriage in pregnant women, in addition to an increased incidence of heart disease during pregnancy and gestational hypertension. Pregnant women should strictly limit the intake of calorie-rich foods and supply them as needed, while strengthening regular exercise to control fetal weight so that the fetus does not grow too fast, and observe fetal development during regular maternity checks. If the fetal weight is not well controlled in late pregnancy, a huge baby may be formed, which increases the risk of obstructed labor, perineal tear, and complications of postoperative infection; the chances of the newborn suffering from hypoglycemia, hypocalcemia, and pulmonary atelectasis are also increased.