The purpose of this secondary analysis was to determine what factors predict the transition of preterm infants to the supine sleep position prior to hospital discharge (N = 286). The supine position reduces the risk of sudden infant death syndrome. Factors found to predict a greater than 1-week transition to the supine sleep position were hospital policy (P < .001), gestational age (P < .001), and birth weight (P < .01). Transition to the supine position during hospitalization potentially reduces the risk of preterm infants being placed in nonsupine positions after hospitalization and, ultimately, the risk of untimely death by sudden infant death syndrome.