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New global indicators aim to reveal how extreme heat affects mothers and children
The World Health Organization and three international partners released a framework on 21 October 2026 for tracking heat-related risks to pregnant women, newborns and children, aiming to help governments combine climate and health data in public-health planning.
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A new framework for an increasingly hot world
On 21 October 2026, the World Health Organization published priority indicators developed with the World Meteorological Organization, UNICEF and the United Nations Population Fund. The framework responds to gaps in how health systems track exposure to excessive heat among pregnant and postpartum women, newborn babies and children.
The publication sets out core and additional measurements across routine maternal and child health monitoring, public-health surveillance, climate and health observations, and heat exposure. Its purpose is to establish usable information that countries can adapt to their own monitoring capacities, rather than to create a single international heat threshold for every population.
What health systems may measure
The organizations propose looking at maternal and newborn outcomes alongside local temperature conditions. These can include preterm births, stillbirths, low birthweight, pregnancy-related hypertension and health-facility visits, while school attendance may help show how heat interrupts children's daily lives.
The central analytical challenge is connecting health outcomes with environmental exposure over time. A change in one indicator does not establish that heat caused an individual medical event; investigators must also consider other clinical, demographic and environmental influences.
What happens after the launch
Countries can use the indicators to identify trends, assess local vulnerability and adapt public-health programmes, such as how services prepare during heatwaves. The accompanying WHO publication offers guidance on analyzing health and exposure data together rather than treating temperature readings as a standalone measure of harm.
The framework is a monitoring tool, not evidence that every proposed indicator is already collected in every health system. Its practical value will depend on data quality, timely reporting and the ability of local authorities to act on emerging risks.