“…Evidence that intestinal dysbiosis precedes and is a risk factor for NEC in preterm infants includes observational studies of the fecal microbiota in infants with and without NEC [ 1 ], increased incidence of NEC with microbiota-altering interventions such as prolonged postnatal administration of antibiotics [ 2 ] and acid-blocking agents [ 3 ], and decreased incidence of NEC and death with administration of probiotics to preterm infants [ 4 ]. The latter has prompted conditional recommendations for routine probiotic prophylaxis for this high-risk group by the WHO, American Gastroenterological Association, and European Society for Paediatric Gastroenterology Hepatology and Nutrition, but not by the American Academy of Pediatrics or the FDA [ 5 ].…”