During bouts of diarrhea, the acid in the stool is very irritating to a baby's skin. Frequent diaper changes are necessary to avoid a painful rash.
Review Date 10/18/2017
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Professor of Pediatrics, University of Washington School of Medicine, Seattle, WA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.