What is infantile umbilical hernia?

Umbilical hernia occurs when a portion of the small intestine protrudes through a defect in the umbilical region, forming a visible swelling at the navel. It is a developmental anomaly and a common condition in infants, with a higher incidence in preterm infants than in full-term infants.Anatomically and developmentally, the umbilicus seals shortly after birth and subsequently heals with the scarred skin left after umbilical cord detachment, rendering the umbilical region a relatively weak area.

Umbilical hernia is also associated with the development of abdominal wall musculature. During infancy, the two rectus abdominis muscles and their anterior and posterior sheaths have not yet fused at the umbilical region—this anatomical immaturity predisposes infants to umbilical hernia.Under these conditions, any factor that increases intra-abdominal pressure—such as coughing, diarrhea, or vigorous crying—may cause abdominal contents to protrude through the unsealed umbilical ring.