Umbilical disorders: the main ones include: umbiliculitis, umbilical eczema, umbilical hernia, umbilical granuloma, umbilical velvet, umbilical fistula, umbilical sinus, umbilical ureteral fistula, umbilical ureteral cyst, umbilical ring fistula. Umbiliculitis: for umbilical infection, antibiotics, local cleaning and drainage. Umbilical eczema: allergies and other factors, external washing, application of eczema treatment drugs. Umbilical hernia: most common, most of them heal spontaneously, consider surgery for those with large umbilical rings over 2-4 years old. Umbilical granuloma: chronic infection or stimulation by talcum powder, etc. Formation of granulation surface. 10% AgNO3 cautery or electrocautery. Umbilical velvet: residual mucosal surface at the umbilical end of the yolk duct, ligation, electrocautery or drug cautery if there is a tip, surgical excision if large. Umbilical fistula: the yolk duct is not closed and all open. Contrast agent enters the small intestine. Surgical excision in hospital. Umbilical sinus: a small portion of the umbilical canal of the yolk duct remains unclosed and the contrast agent is near the umbilical recess. Children are hospitalized for surgery after June. Umbilical ureteral fistula: Umbilical ureter is not closed and all of it is open. Contrast agent enters the bladder. Hospitalization for surgery. Umbilical ureteral cyst: the umbilical ureter is closed at both ends and has a cystic cavity in the middle. Inpatient surgical treatment. Umbilical ring fistula: large amount of ascites leaking from the abdominal cavity. The contrast agent enters the abdominal cavity and is locally adhered with bioadhesive or pressure bandaged or taped.