Preemies' Gut Bacteria May Depend More on Gestational Age Than Environment (image) Washington University School of Medicine Share Print E-Mail Caption Barbara Warner, M.D., (left) and nurse Laura Linneman, a clinical research coordinator, check on Skylar Angel in the neonatal intensive care unit at St. Louis Children's Hospital. Skylar and her twin, Bayley, were born prematurely. Warner is co-first author of a Washington University School of Medicine study reporting that the population of bacteria in the intestinal tracts of premature infants may depend more on the babies' biological makeup and gestational age at birth than on environmental factors. Credit E. Holland Durando/Washington University Usage Restrictions Please do not use until the embargo lifts 3 p.m. ET Monday, Aug. 11, 2014. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.