High-risk children include: 1) abnormal gestational age, preterm babies with gestational age <37 weeks, and overdue babies with gestational age >42 weeks; 2) abnormal weight, small-like babies with weight <2500g, and huge babies with weight >4000g; 3) abnormal delivery, cesarean section, use of forceps, and abnormalities such as negative pressure suction, stalled labor, and emergency delivery; 4) maternal abnormalities, such as placental abruption, placenta praevia with bleeding, premature rupture of membranes, Gestational diabetes, gestational hypertension, gestational anemia, gestational hyperthyroidism or hypothyroidism, gestational syphilis, gestational hepatitis, gestational thrombocytopenia, prenatal fever, etc., all of these children are at high risk after birth.