Necrotizing enterocolitis most commonly occurs in which population?

• A. Term infants with bottle feeding
• B. Adolescents with Crohn's disease
• C. Mostly preterm infants with underdeveloped intestinal/gut immunity
• D. Full-term infants exclusively breastfed

Answer: (C)

Necrotizing enterocolitis is most likely to develop in premature newborns because their intestines are immature and their gut immune defenses are underdeveloped, making the bowel more vulnerable to injury from feeding and bacteria. This immature barrier and altered microbial colonization can lead to inflammation and necrosis of the intestinal tissue when stressors are introduced after birth. Breast milk provides protective factors that help mature the gut and modulate inflammation, which is why the risk is lowest in term infants who are breastfed. Term infants who are bottle-fed can still develop NEC, but the condition is far more common in preterm infants. Adolescents with Crohn's disease have a different disease process, not NEC, so they are not the typical population affected. In short, the population most at risk is mostly preterm infants with underdeveloped intestinal and immune function.