Aim 1: Examine the association between built environment and PPD and develop a PPD risk model. Aim 2: Interview clinicians on the utility of the PPD risk model on maternal and children’s outcomes. Aim 3: Identify effects of built environment factors associated with PPD and children’s allergic diseases. Research outcomes in the form of a PPD risk prediction model are expected to be submitted as provisional patent through Cornell University’s Center for Technology Licensing. In addition, research outcomes will be published as journal publications, and communicated to clinicians at Weill Cornell Medicine’s clinics as patient and provider education pamphlets and flyers. We aim to identify built environment related factors that affect PPD, and indirectly, children’s health, that may facilitate strategies to better protect maternal and children’s health. By working with a local clinic, we expect our study findings to be translated into patentable risk reduction algorithms that incorporate clinical and environmental factors to assist in routine maternal and children’s health care.