For the following conditions, you should be alerted to the possibility of diabetes: unexplained dry mouth, easy thirst; unexplained weight loss, rapid weight loss; fatigue and weakness, unable to concentrate at work; obese, with high blood fat, high blood pressure, coronary heart disease, etc.; prone to “boils” or other purulent inflammatory diseases on the skin, or prone to Urinary tract infections; itching of the vulva or itchy skin, and topical application of general dermatological drugs is ineffective; loss of vision or blurred vision …… Since pregnant women with the following factors are more likely to develop gestational diabetes than ordinary pregnant women, screening should be performed: maternal age > 30 years; family history of diabetes; history of unexplained abnormal deliveries, such as miscarriage, stillbirth, etc.; significant obesity; family history of diabetes; history of unexplained abnormal deliveries, such as miscarriage, stillbirth, etc. The following should be screened: maternal age > 30 years; family history of diabetes; history of unexplained abnormal births, such as miscarriage, stillbirth, etc.; significant obesity; excessive amniotic fluid; recurrent episodes of Candida vaginitis and folliculitis. The main risks of hyperglycemia during pregnancy for children are increased risk of neonatal malformations, giant babies (increased risk of comorbidities and trauma to mother and baby during delivery) and various neonatal complications including hypoglycemia, asphyxia, erythrocytosis, jaundice, etc. The proportion of children born with type 2 diabetes in the future is greatly increased.