Pregnant women and newborns are feeling the sharp edge of a warming world, with medical experts sounding the alarm that extreme heat is driving up risks of preterm birth, stillbirth and low birth weight. A new survey commissioned by the Wellcome Trust shows that three‑quarters of clinicians across five countries have already witnessed a surge in heat‑related complications among expectant mothers and their babies. The findings come as the Northern Hemisphere sweltered through its hottest summer on record and the globe posted its warmest August ever, prompting calls for urgent action at upcoming climate talks in Fiji and Turkey.
Survey Highlights Growing Clinical Concerns
The Wellcome Trust poll gathered responses from 1,000 doctors, midwives and nurses working in Australia, Brazil, India, the United Kingdom and Zimbabwe. Seventy‑three percent said they had noticed more medical issues for pregnant women during hot spells, while 76 % reported seeing problems in fetal or newborn health linked to rising temperatures. Nearly every respondent (99 % for mothers, 98 % for infants) had cared for someone they believed was affected by extreme heat.
Specific ailments cited by more than a third of participants included low birth weight or restricted growth (34 %), dehydration or heat‑related illness (36 %), and difficulties with feeding, breathing or temperature regulation (also 36 %). One in four clinicians warned that hotter weather is making it harder for pregnant women to reach clinics or secure transport, adding a logistical layer to the medical burden.
Quantifying the Risk
Researchers translating the clinical observations into numbers estimate that exposure to a heatwave raises a pregnant woman’s chance of suffering obstetric complications by 25 %. For each additional degree Celsius of heat exposure, the likelihood of a preterm birth climbs by roughly five percent. These figures echo earlier studies linking maternal heat stress to early delivery, stillbirth and reduced fetal growth.
Julia Gillard, chair of Wellcome and former prime minister of Australia, stressed the clarity of the evidence: “The data show a direct line between extreme heat and more pre‑term babies, more stillborn babies, and greater maternal risk.” She added that frontline staff often lack the tools and training needed to cope with the growing challenge.
Climate Summits Called to Address Maternal Health
The survey’s release coincided with a pre‑COP gathering in Nadi, Fiji, held from 5‑8 October 2026, which aims to turn past climate pledges into concrete steps before the main COP31 summit in Antalya, Turkey (9‑20 November). Delegates from Pacific island nations—already grappling with sea‑level rise, damaged reefs and frequent storms—are urging that maternal and neonatal health be woven into global adaptation plans.
Campaigners warn that without targeted funding and clear clinical guidance from the World Health Organisation, health systems will remain ill‑prepared. They point to the UN Environment Programme’s September announcement that the world is on track to exceed the 1.5 °C ceiling set in the Paris Agreement, a threshold the WHO calls the single greatest threat to public health, projected to cause an extra 250 000 deaths each year from malnutrition, malaria, diarrhoea and heat stress.
Why it Matters
When temperatures climb, the most vulnerable—expectant mothers and their newborns—bear the brunt of a crisis that is often invisible in policy debates. The evidence is clear: heat exposure raises the odds of preterm birth, stillbirth and low weight, while simultaneously hindering access to care. Ignoring this link not only jeopardises individual lives but also undermines broader efforts to build resilient health systems in a warming world. Leaders now have both the data and the solutions; turning them into action could spare countless families from preventable loss and set a precedent for integrating health equity into climate strategy.
