High outdoor temperatures are already experienced by many populations, but heat risks have been poorly quantified for some regions and vulnerable groups, including pregnant women and children. Heat exposures are currently not considered within the guidance for maternal and newborn care, but pregnant women are increasingly being recognised as an at-risk group within Heat Health Action Plans. This seminar will give an overview of the findings of research undertaken by the CHAMNHA research collaboration. The findings can be used to inform planning for response measures, including climate services. The CHAMNHA research consortium has an interdisciplinary and transdisciplinary approach. Cherie Part will present results from epidemiological studies to improve understanding of heat risks in vulnerable populations. Adelaide Lusambili will discuss the findings of the qualitative research undertaken in Kilifi, Kenya, to understand the experience of pregnant and postpartum women, as well as family members, community health workers and community leaders. Co-design was used to develop behaviour change interventions that have been evaluated for feasibility.