In the SMART study, we propose a 4-arm RCT in which 16 hospitals completing participation in the SAFE study are randomly assigned to one of the following groups (with Safe Sleep Intervention and/or Breastfeeding Control): 1) Safe Sleep Nursery Education and Breastfeeding mHealth messaging; 2) Breastfeeding Nursery Education and Safe Sleep mHealth messaging; 3) Safe Sleep Nursery Education and Safe Sleep mHealth messaging; and 4) Breastfeeding Nursery Education and Breastfeeding mHealth messaging. We are uniquely positioned to design, implement and test the effectiveness of these interventions in a methodologically rigorous way and propose the following specific aims: Primary Aim: To assess the effectiveness of the interventions aimed at promoting safe sleep practices compared with the breastfeeding controls.