Parikh RC, et al. - Authors analyzed data available from published literature and from nationally representative databases of US infant hospitalizations to generate a composite description of the effect of young chronologic age on respiratory syncytial virus (RSV) hospitalizations among US preterm and term infants by individual month of age. The data established that the greatest risk of RSV hospitalization occurs during the first 6 months of life among US preterm and term infants. Strategies to prevent infant RSV hospitalizations should be targeted to infants during the first months of life.