I. What does it mean to have a huge baby? The definition of macrosomia varies from country to country, and in China, birth weight over 4000g is currently used as the diagnostic criterion. The incidence of macrosomia The worldwide incidence of babies with birth weight ≥4000g is about 9%, and the incidence of babies with birth weight ≥5000g is about 0.1%, but there are great differences between different countries. The incidence of macrosomia in China is around 7%. Third, the risk of adverse outcomes increases with the degree of macrosomia. With a birth weight of 4000-4499g, delivery abnormalities and neonatal complications begin to increase. With a birth weight of 4500-4999g, maternal and neonatal complications increase further. With a birth weight ≥5000g, there is an increased risk of stillbirth and neonatal death. IV. What are the specific risks of macrosomia? 1. For the mother: increased incidence of prolonged or stalled labor, vaginally assisted delivery (forceps or fetal suction), cesarean section, genital tract lacerations (vaginal, anal sphincter, and rectal), postpartum hemorrhage, and uterine rupture. 2. To the fetus: the risk of birth injury (brachial plexus injury and fracture) or asphyxia due to shoulder dystocia increases with fetal weight. 3. Risks to the newborn: hypoglycemia, respiratory problems, erythrocytosis, minor congenital anomalies, increased risk of hospitalization and prolonged stay (more than 3 days) in the neonatal intensive care unit (NICU). 4. Risks in childhood and beyond: obesity, impaired glucose tolerance, metabolic syndrome, cardiac remodeling (increased aortic intramedullary thickness and left ventricular mass). v. What are the risk factors for the delivery of a giant baby? V. What are the risk factors for delivering a large child? 1, physical factors: such as family traits, male gender, Caucasian, etc.; 2, environmental factors: such as maternal diabetes, weight gain during pregnancy, maternal obesity, expired pregnancy, menstruation, and early gestation with a large placenta; 3, heritable genetic variants, such as Beckwith-Wiedemann syndrome. Sixth, how to prevent the occurrence of giant babies? 1.Diabetic women: adjust the diet to control blood sugar. In pregnant women with diabetes, the average blood glucose level needs to be lower than 5.6mmol/L, which can realize the incidence of macrosomia comparable to non-diabetic pregnancy population. 2, obese women: weight loss before pregnancy, can be through diet, exercise, behavior modification to reduce to standard weight. Almost all diet pills have adverse effects on the fetus, so they should not be applied during pregnancy. 3.Normal weight women: avoiding excessive weight gain during pregnancy can reduce the risk of macrosomia.