This document summarizes a gender-informed program called "What Were We Thinking" that aims to prevent postnatal mental health problems in women. It discusses the partnership between Monash University and Jean Hailes for Women's Health that generates and translates knowledge on this topic. It also provides information on prevalence of postnatal mental disorders, risk factors, existing prevention approaches, and describes the psychoeducational program components and evaluation through a randomized controlled trial. Translations for health professionals and consumers are discussed, along with strategies for sustainability.