Copyright © 2017 American Academy of Pediatrics. From: Failure to Thrive: Pediatric Undernutrition American Academy of Pediatrics Textbook of Pediatric Care, 2nd Edition, 2017 Figure Legend: Failure to ThriveA 5-year-old with eczema with failure to thrive attributed to phenylketonuria without benefit of a low phenylalanine diet prior to knowledge about the advantages. Courtesy of Edgar O. Ledbetter, MD, FAAP. Date of download: 12/15/2017 Copyright © 2017 American Academy of Pediatrics. All rights reserved.