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A groundbreaking clinical trial led by researchers at the University of Warwick, University Hospitals Coventry and Warwickshire NHS Trust (UHCW), and the Perinatal Institute has provided new evidence that empowers women expecting large babies to make informed choices about their delivery. Published in The Lancet, the Big Baby Trial is the largest study of its kind, involving 2,893 women across 106 hospitals in Great Britain.
Key Findings
The trial focused on pregnancies where babies were suspected to be large for gestational age-defined as weighing more than 90% of babies at the same stage. Large babies are at increased risk of complications such as shoulder dystocia, a condition where the baby’s shoulder becomes stuck during delivery, potentially leading to fractures, nerve damage, or brain injury. However, the study found these complications to be rare, likely due to the high level of training among delivery staff.
Contrary to previous evidence, the trial revealed that inducing labor a week to 10 days earlier significantly reduced the risk of shoulder dystocia. Importantly, this approach also lowered the need for emergency cesarean sections and did not increase the risk of maternal tearing.
Empowering Women’s Choices
The findings offer women more options and control over their birth plans. Women can now choose to:
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Wait for labor to start naturally with reassurance that the risk to their baby is not increased if delivery occurs in a well-equipped hospital.
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Opt for a planned cesarean section if preferred.
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Consider induction at 38 weeks to reduce the risk of shoulder dystocia, without worrying about a higher likelihood of emergency cesarean or maternal tears.
Eve Morgan, a participant in the trial, shared her positive experience: “I wanted a natural birth for my baby. Monitoring predicted my baby would be large, but I was able to try non-hormonal methods to start labor and had a safe, natural delivery.”
Expert and Community Response
Professor Siobhan Quenby, lead researcher, expressed delight at the trial’s impact: “This trial provides data that empowers women to choose how and when they want to deliver their baby.”
Nadine Montgomery, whose own experience with shoulder dystocia led to her son requiring ongoing care, welcomed the findings: “We now have pivotal evidence to allow women to make free and valid choices about how to give birth to bigger babies. This will undoubtedly lead to safer outcomes for mothers and babies.”
Katie Morris, NIHR National Clinical Specialty Lead for Reproductive Health and Childbirth, added: “These findings offer crucial evidence that will help improve the chances of a safe birth and support expectant mothers and medical staff in making the most informed choices.”
Looking Ahead
The Big Baby Trial sets a new standard in maternity care, providing robust evidence to guide clinical practice and support women in making informed, personalized decisions about childbirth.
Reference:
Jason Gardosi et al, Induction of labour versus standard care to prevent shoulder dystocia in fetuses suspected to be large for gestational age in the UK (the Big Baby trial): a multicentre, open-label, randomised controlled trial, The Lancet (2025). DOI: 10.1016/S0140-6736(25)00162-X
Disclaimer:
This article is based on the findings of the Big Baby Trial as reported by Medical Xpress and published in The Lancet. The information provided is for general knowledge and should not be considered medical advice. Always consult with a qualified healthcare professional regarding your pregnancy and childbirth options. Individual circumstances may vary, and decisions should be made in consultation with your healthcare provider.
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