Maternal Risk, Fetal-Neonatal Brain Connectivity, and Early Neurodevelopment: A Longitudinal Observational Study

This single-center, prospective longitudinal observational cohort study-entitled Maternal Risk, Fetal-Neonatal Brain Connectivity, and Early Neurodevelopment (MaMRI-NeUCogI)-is designed to explore the relationship between maternal risk profiles, early-life brain connectivity, and developmental outcomes from birth to early childhood (up to 72 months). The protocol aims to trace the temporal continuity between functional neurodevelopmental markers present in utero or shortly after birth and subsequent cognitive, behavioral, and emotional trajectories during early childhood.

Scientific Rationale A key challenge in developmental neuroscience is identifying early biomarkers that can predict individual differences in neurodevelopmental trajectories. The fetal and neonatal periods represent critical windows during which the brain undergoes major organizational changes. Disruptions or variations in these processes-particularly in the presence of maternal medical, psychological, or environmental risks-may lead to atypical connectivity patterns that forecast later neurodevelopmental difficulties.

This study leverages resting-state functional MRI (rs-fMRI) in fetuses and neonates to map the functional architecture of core neural systems (sensorimotor, auditory, visual, language, and attention). The project builds upon prior work from the Italian Ministry of Health's "Ricerca Finalizzata 2016" (grant number RF-2016-02364081; Principal Investigator: Dr. Pasquale Anthony Della Rosa), expanding its focus to include a multivariate risk framework and an artificial intelligence-based predictive modeling approach.

Study Population and Grouping

A total of 160 pregnant women will be enrolled from the Gynecology and Obstetrics Unit at San Raffaele Hospital, Milan. They will be stratified into two groups based on the Maternal Frailty Inventory (MaFra) developed by Della Rosa et al. (2021), which integrates clinical (e.g., obstetric, gynecological) and non-clinical (e.g., psychological, lifestyle) risk factors:

• Medium-to-high risk group (n = 96): Representing mothers with significant maternal frailty indices.
• Low-risk group (n = 64): Reflecting minimal clinical and psychosocial risk burden.

This stratification is established a posteriori based on a risk profile classification aligned with research goals, and is not connected to clinical diagnoses or intervention decisions.

Imaging Protocol and Data Collection

All participants will undergo fetal and/or neonatal rs-fMRI, depending on clinical indications and risk group membership. Imaging data will be used to derive metrics of functional connectivity, specifically:

• Local connectivity: Connectivity between regions within the same system (e.g., sensorimotor, auditory).
• Global connectivity: Connectivity between regions across different systems.
• Segregation indices: Reflecting within-system connectivity.
• Integration indices: Reflecting cross-system connectivity. Functional connectivity parameters will be estimated for each subject using region-based parcellations aligned with validated fetal and neonatal brain templates. Structural MRI will also be acquired to confirm normative brain development and rule out major anomalies.

Longitudinal Neurodevelopmental Follow-up

Children born to participating mothers will undergo standardized neuropsychological assessment at several developmental milestones from birth to 72 months. These assessments will yield dimensional scores across various cognitive, behavioral, and emotional domains, including:

• Sensorimotor processing
• Language development
• Attention and executive function
• Socioemotional regulation
• Adaptive behavior The association between early brain connectivity and later neurodevelopmental performance will be analyzed using both correlational methods and predictive modeling frameworks.

Artificial Intelligence and Prediction Modeling A core innovation of the MaMRI-NeUCogI study lies in the use of ML models trained on imaging-derived connectivity features and maternal risk indices. The goal is to predict multidimensional developmental trajectories. The resulting predictive framework is intended to quantify deviation from typical developmental trajectories and may serve in the future to inform early intervention strategies.

Secondary Aims: Maternal Emotional State influence on fetal brain connectivity A secondary component of the study investigates the impact of emotional responses to music on fetal brain connectivity. During fetal rs-fMRI, participating mothers will listen to emotionally evocative music. The study will examine how maternal emotional valence and arousal ratings relate to fetal connectivity patterns.

Data Integration and Analytic Plan

The study adopts a multi-tiered analytic approach:

• Descriptive statistics for maternal risk profiles and neurodevelopmental scores.
• Group comparisons across maternal risk strata.
• Correlation and regression analyses between functional connectivity metrics and neurodevelopmental outcomes.
• Predictive modeling using machine learning to predict later developmental profiles.

All analyses will consider longitudinal dependencies, potential confounders (e.g., gestational age, birth outcomes), and interactions between maternal risk variables and imaging biomarkers.

Inclusion criteria

• Pregnant women (biologically female) receiving care at the Gynecology and Obstetrics Unit, San Raffaele Hospital, Milan.
• Age ≥ 18 years at time of enrollment.
• Singleton pregnancy.
• Gestational age within the range suitable for fetal MRI acquisition (typically 24-35 weeks gestation).
• Willing and able to provide written informed consent.
• Willing to undergo fetal and/or neonatal resting-state fMRI as part of the observational study protocol.
• Willing to complete maternal questionnaires assessing clinical, lifestyle, and emotional factors (e.g., MaFra Inventory, anxiety scales).
• Willing to participate in postnatal follow-up assessments of the child, including neurodevelopmental evaluations from birth to 72 months.
• Fetuses with normal brain morphology confirmed by structural MRI.
• Fetuses and neonates without signal alterations on structural MRI.

Exclusion criteria

• Twin or multiple gestation pregnancies.
• Fetal diagnosis of any major structural or genetic anomaly known to impact neurodevelopment.
• Evidence of fetal brain parenchymal signal alterations or neurodevelopmental abnormalities as assessed by structural MRI and confirmed by an experienced neuroradiologist.
• Maternal contraindications to undergoing MRI (e.g., presence of non-MRI-compatible implants or severe claustrophobia).