J Allergy Clin Immunol 146 (6): 1217 - 1270, 2020. doi: 10.1016 / j. jaci.2020.10.003 Special Populations Infants, children, and adolescents Asthma is difficult to diagnose in infants; thus, under-recognition and undertreatment are common (see also Wheezing and Asthma in Infants and Young Children).