Fetal growth restriction, characterized by slower-than-expected intrauterine growth, is a critical predictor of adverse pregnancy outcomes. Detecting this condition prenatally is essential to improve neonatal safety and reduce avoidable perinatal deaths. However, the standard ‘one-size-fits-all’ growth charts currently implemented across NHS hospitals lack adjustment for maternal factors influencing fetal growth, such as maternal weight, ethnicity, and other physiological characteristics.

The study led by researchers at the Perinatal Institute in Birmingham compared seven widely used fetal growth standards, including Hadlock, Intergrowth-21st, World Health Organisation (WHO), Fetal Medicine Foundation (FMF), and the customised GROW charts. Unlike the universal charts, which use fixed references derived mostly from international populations, GROW employs a customizable algorithm, adapting fetal growth expectations based on individual maternal parameters.

Results underscored stark variability: rates of babies classified as small for gestational age (below the 10th centile) at term fluctuated considerably from 4.8% using Intergrowth charts to 17.2% with WHO and FMF charts, while GROW charts reported an intermediate rate of 12.3%. Moreover, unadjusted charts revealed inconsistent identification rates across different NHS regions reflecting local demographic differences, a variability not seen in customised assessments.

Importantly, the researchers utilized birthweight data for the analysis, acknowledging that ultrasound-estimated fetal weights might offer different insights but noting that birthweight metrics allowed inclusion of the entire cohort regardless of prenatal scan availability. The observational nature of the study provides strong epidemiological evidence but calls for further prospective validation.

These findings advocate urgent NHS-wide standardisation towards customised fetal growth assessment tools to enhance detection accuracy, improve clinical decision-making, and reduce avoidable fetal mortality. The study also calls for establishing real-time national oversight mechanisms to monitor chart performance, ensuring consistent quality and safety in maternity care.

The misapplication of non-personalised growth charts risks both false reassurance and overdiagnosis, potentially compromising maternal and fetal outcomes. This large-scale population study amplifies the pressing need for tailored clinical protocols that harmonize with diverse patient populations across the NHS.

As the NHS seeks to reduce perinatal mortality and improve antenatal care safety, adopting customised growth models may represent a critical evolution in fetal surveillance, aligning care with individual biological variance and scientific precision.

Subject of Research: People
Article Title: Designation of small for gestational age according to seven fetal growth charts in England’s National Health Service: population based cohort study of 3.2 million births
News Publication Date: 8-Jul-2026
Web References: http://dx.doi.org/10.1136/bmj-2026-433307
Keywords: Fetal growth charts, customized growth standards, fetal growth restriction, stillbirth risk, NHS maternity care, perinatal mortality, epidemiology

Historically, uncertainty in medicine has been conceptualized through various taxonomies, with Han’s framework standing out as one of the most influential. It categorizes uncertainty into distinct dimensions based on its source, perceived nature, and locus. However, while broadly applicable across medical disciplines, this framework does not fully capture the nuanced and often unique challenges that arise in neonatal intensive care settings, where uncertainty navigates the fragile boundary between life and death, hope and despair. Recognizing this, the authors embarked on an exhaustive systematic literature search focusing on how uncertainty manifests specifically within the NICU.

The review synthesized findings from 55 key studies, encompassing qualitative and quantitative research addressing uncertainty experienced by both medical teams and parents of critically ill neonates. This large and diverse body of literature shed light on the multifaceted nature of uncertainty, offering insight into its psychological, ethical, prognostic, informational, and communicative dimensions. Rather than merely reaffirming existing definitions, the analysis revealed critical gaps and context-specific factors necessitating a tailored taxonomy that better reflects this unique clinical milieu.

One of the core contributions of the study is the identification of three major modifications to Han’s taxonomy, demonstrating that a one-size-fits-all approach to understanding uncertainty is insufficient in the NICU. The first alteration pertains to the source of uncertainty; in the NICU, uncertainty is not solely rooted in diagnostic or prognostic ambiguity but is also heavily influenced by emergent ethical dilemmas and evolving parental expectations. Medical teams often contend with rapidly shifting clinical trajectories that challenge conventional predictive models, while parents face an emotional landscape fraught with anticipatory grief and decision paralysis.

Secondly, the nature of uncertainty in neonatal care demands re-examination. Traditional taxonomies distinguish uncertainty as either epistemic (knowledge-related) or aleatory (inherent randomness), but the NICU setting introduces a layered interplay of these elements amplified by prognostic indeterminacy and technological complexities. For instance, advanced life-support techniques prolong survival but may simultaneously increase unpredictability regarding long-term neurodevelopmental outcomes, creating a persistent sense of liminality for families and providers.

The third major adaptation involves the locus of uncertainty—the individual or group experiencing and responding to it. Unlike adult care contexts where uncertainty may primarily reside with the patient, in the NICU uncertainty resides within a triad comprising the infant’s health status, parental emotional responses, and the medical team’s clinical judgments. Communication dynamics are further complicated by the need to balance truthful yet empathetic dialogue, necessitating sophisticated strategies that address the diverse informational and emotional needs of all stakeholders.

Beyond conceptual refinements, the review offers practical implications for clinical practice. By articulating a more nuanced taxonomy, it equips healthcare professionals with a framework to better identify and articulate the prevailing uncertainties at different stages of neonatal care. This clarity fosters enhanced interdisciplinary communication, enabling more effective shared decision-making and psychosocial support tailored to the unique developmental and emotional contexts of the newborn and family.

Further, the authors emphasize the critical importance of targeted interventions designed to navigate these uncertainties. Psychological counseling and structured communication training emerge as pivotal tools for mitigating distress among parents and clinicians alike. Facilitating transparent yet compassionate conversations about prognosis, treatment options, and possible outcomes can reduce cognitive overload and empower families with agency amid an inherently unpredictable journey.

The review also draws attention to the ethical tensions that uncertainty engenders within the NICU. Decisions around the initiation or withdrawal of life-sustaining therapies often occur under conditions of profound uncertainty, challenging conventional bioethical paradigms. A refined taxonomy helps elucidate these dilemmas, underpinning the development of ethical guidelines and institutional policies that are both responsive and sensitive to the fluctuating clinical realities and stakeholder values.

Importantly, the study highlights persistent research gaps, underscoring the need for longitudinal studies and real-world evaluations of interventions addressing uncertainty. Capturing how uncertainty evolves over time and its impact on family and staff resilience remains a vital frontier. Similarly, exploring culturally responsive frameworks that recognize diverse perspectives on uncertainty and risk is essential to fostering equitable and inclusive care environments.

By fostering a more granular understanding of uncertainty in the NICU, this scoping review bridges conceptual theory with practical application, resonating deeply within the fields of neonatology, bioethics, psychology, and health communication. Its findings not only provide a roadmap for future research but also hold promise for transforming the lived experience of families navigating the fragile beginnings of life alongside the healthcare professionals who serve them.

In an era where medical technology advances at unprecedented speeds, juxtaposed with rising expectations from families for clarity and control, recognizing the unique contours of uncertainty in the NICU is paramount. This refined taxonomy shapes a shared language that demystifies uncertainty, enabling a concerted response characterized by empathy, clarity, and collaborative problem-solving.

The synergy between parental perspectives and medical expertise is paramount for evolving care standards, and this study’s novel framework serves as a catalyst toward fostering this synergy. Importantly, enhancing understanding about uncertainty holds potential benefits beyond emotional processing—it can improve clinical outcomes by informing better-tailored care plans and supporting ethical decision-making processes grounded in transparency and mutual respect.

As healthcare systems globally grapple with the complexities of delivering family-centered care in intensive settings, integrating such nuanced insights into policy and practice becomes crucial. This study’s synthesis shines a spotlight on both the shared and divergent uncertainties endemic to neonatal care, offering actionable knowledge that transcends disciplinary silos to ultimately better the neonatal intensive care experience.

The promise of this research lies not only in its theoretical contributions but also in its capacity to stimulate innovative educational curricula for healthcare trainees and continuing professional development focused on uncertainty management. Teaching clinicians to recognize, articulate, and address uncertainty skillfully enhances their resilience and, by extension, the trust and confidence families place in the NICU healthcare team.

In conclusion, uncertainty is an inseparable facet of neonatal intensive care, but it need not remain an opaque or overwhelming force. Through rigorous analysis and thoughtful adaptation of existing conceptual tools, Krick and colleagues provide a vital resource that advances both understanding and practical management of uncertainty. This bespoke taxonomy marks a critical milestone in neonatal care literature, poised to influence future research agendas, clinical interventions, and ultimately, the well-being of newborns and their families navigating the NICU.

Subject of Research: Uncertainty in Neonatal Intensive Care Unit (NICU) settings and its impact on parents and medical teams.

Article Title: Uncertainties in the NICU: a scoping review to inform a tailored taxonomy.

Article References:
Krick, J.A., Rholl, E.L., Callahan, K.P. et al. Uncertainties in the NICU: a scoping review to inform a tailored taxonomy. J Perinatol (2025). https://doi.org/10.1038/s41372-025-02299-w

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41372-025-02299-w