370The Impact of Early Life Antibiotic Exposure on Childhood Weight Gain

370. The Impact of Early Life Antibiotic Exposure on Childhood Weight Gain Jeffrey S. Gerber, MD, PhD; Elizabeth Prout, MD, MSCE; Rachael Ross, MPH; Matthew Bryan, PhD; Robert Grundmeier, MD; Evanette Burrows; Carrie Daymont, MD, MSCE; Virginia Stallings, MD; Theoklis Zaoutis, MD, MSCE; Department of Pediatrics, Division of Infectious Diseases, The Children’s Hospital of Philadelphia, Philadelphia, PA; Division of Gastroenterology, Hepatology, and Nutrition, Children’s Hospital of Philadelphia, Philadelphia, PA; The Children’s Hospital of Philadelphia, Philadelphia, PA; Department of Pediatrics, Children’s Hospital of Philadelphia, Philadelphia, PA; General Pediatrics, The Children’s Hospital of Philadelphia, Philadelphia, PA; Children’s Hospital of Philadelphia, Philadelphia, PA; University of Manitoba, Winnipeg, MB, Canada; Division of Infectious Diseases, Center for Pediatric Clinical Effectiveness, the Children’s Hospital of Philadelphia, Philadelphia, PA, The Children’s Hospital of Philadelphia, Philadelphia, PA