The pressing need to address Perinatal Mental Health (PMH) globally has garnered increasing attention in recent years, particularly as the COVID-19 pandemic further worsened mental health outcomes for women during pregnancy, childbirth, and the postpartum period. On October 20, 2022, MOMENTUM Country and Global Leadership and global experts held a webinar to share and explore new resources for PMH, including a global Theory of Change, and to discuss how to align behind a shared global vision to improve maternal and newborn health.