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You are seeing a 5 day old infant born term without complications brought to the ED because the parent noted a streak of bright red blood in the diaper. The baby is formula feeding well, not lethargic, has no fever, and has had a few non-bilious spit-up episodes. Physical exam shows mild abdominal distension; no anal fissure seen.

Which of the following is true of necrotizing enterocolitis (NEC)?