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- occurs when the small opening in the abdominal muscles which allows passage of umbilical cord does not completley close after birth
- allowing intestinal loops to pass through the opening
- 10% of all children are affected
- more common in blacks, girls, and premature infants
- most resolve by age 1year, but consider outpatient referral if becoming larger or still present after 2-3 years of age
- emergent consultation if not reducible, but rarely as most are harmless