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.
Update Date 11/7/2011
Updated by: Neil K. Kaneshiro, MD, MHA, Clinical Assistant Professor of Pediatrics, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.