FOA PAR-11-242 seeks research that will improve the design, implementation, and effectiveness of interventions to prevent Sudden Infant Death Syndrome (SIDS) and unintentional injury-related infant deaths associated with the sleep environment. The SMART (Social Media and Risk Reduction Training) Infant Care Practices proposal is a collaborative effort among researchers who collectively have generated much of the data on infant care practices that underlie the need for this FOA, and who have access to an already existing and operational infrastructure that permits performance of a large randomized clinical trial to study preventative interventions. This infrastructure was created for the NICHD-funded SAFE Infant Care Practices study, for which mothers are being recruited in 2011, 2012, and 2013 at a nationally-representative group of birth hospitals, with completion of infant care practice surveys at 2-5 months after birth. These hospitals, which will complete their participation in SAFE during 2013, are geographically and culturally diverse, will have had 3 years of baseline infant care practice data collected, and have a proven track record of successful recruitment. We will use our collective extensive experience studying barriers to adherence to safe sleep practices to develop two complementary, culturally competent intervention strategies and to test the effectiveness of each strategy, as well as both strategies in combination. Both of the proposed intervention strategies, described below, were selected largely because they can be used in diverse populations and offer the potential to be rapidly disseminated nationwide.