Assessing the impact of early nutrition interventions on cognitive and motor development in preterm infants: a longitudinal cohort study

Project Abstract

Early nutrition interventions during the first weeks of life critically shape neurodevelopmental trajectories in preterm infants, influencing cognitive outcomes and motor skills through infancy and early childhood. This longitudinal cohort study follows a multi-center sample of 350 preterm infants born at <34 weeks gestation, examining the dose-response relationship between early nutritional adequacy—caloric intake, protein quality, fatty acid profile (including DHA and ARA), and micronutrient supplementation—and subsequent cognitive and motor performance up to 5 years corrected age. Data were collected prospectively from birth to 60 months, with nutrition data captured daily during the NICU stay and at structured follow-up visits. Primary outcomes include standardized cognitive development scores (Bayley Scales of Infant Development III and WPPSI-IV at follow-ups), and motor development indices (gross and fine motor subscales). Secondary outcomes encompass language development, behavioral regulation, and social-emotional functioning, alongside growth parameters and brain growth metrics obtained via serial cranial ultrasounds and, in a subsample, MRI volumetrics. Analytical strategies employed mixed-effects linear models to account for repeated measures and potential confounders such as gestational age, birth weight, sex, infection status, parental socioeconomic status, and breastfeeding exclusivity. Propensity score weighting was used to mitigate selection bias between infants receiving protocolized early nutrition interventions versus standard feeding practices. Mediation analyses explored whether growth trajectories and biomarkers of oxidative stress and inflammation mediated the relationship between early nutrition and neurodevelopmental outcomes. Sensitivity analyses assessed the robustness of findings to missing data via multiple imputation and to potential misclassification of nutritional exposure. Results indicate that higher early protein and energy delivery within the first 14 days of life is associated with significantly higher cognitive scores at 24 months corrected age (? = 0.26, p = 0.003) and sustained through 60 months (? = 0.21, p = 0.01), independent of major confounders. Long-chain polyunsaturated fatty acids (LC-PUFAs) supplementation correlated with improved motor outcomes at 12 and 24 months (gross motor ? = 0.18, p = 0.02; fine motor ? = 0.15, p = 0.04), with stronger effects observed in infants with lower birth weights. Growth velocity in the first six months moderated the nutrition-development association, indicating that rapid catch-up growth amplified cognitive gains in the context of adequate protein-energy intake. Inflammation biomarkers showed partial mediation, suggesting that nutritious early diets may reduce inflammatory burden, thereby facilitating neural development. Breastfeeding status amplified benefits, particularly for motor outcomes, possibly through bioactive milk components and improved gut-brain axis signaling. The study supports targeted early nutrition protocols emphasizing sufficient protein and energy delivery, LC-PUFA enrichment, and early breastfeeding support for vulnerable preterm populations, with lasting implications for cognitive and motor development. These findings advocate for NICU feeding policies that prioritize individualized caloric and protein goals, integrate LC-PUFA supplementation, monitor growth trajectories, and promote sustained post-discharge nutrition to optimize neurodevelopmental outcomes in preterm infants. Further research should explore gene–nutrient interactions and the long-term educational and psychosocial consequences beyond early childhood.

Project Overview

What This Project Is About

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A plain-language overview of the topic and what the project investigates.

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The Problem It Addresses

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What problem or gap this project tackles and why it matters to the field or society.

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Objectives of the Project

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1. Describe how early nutrition interventions are defined for preterm infants.
2. Assess whether these interventions relate to better cognitive outcomes over time.
3. Assess whether these interventions relate to better motor development over time.
4. Compare results across different preterm age groups and birth weights.
5. Identify practical guidelines for neonatal nutrition to support development.

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What You Will Do Step by Step

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1. Review literature to summarize current knowledge on early nutrition and development in preterm infants.
2. Define study design and recruit a cohort of preterm infants with documented nutrition interventions.
3. Collect data on dietary intake, growth metrics, and developmental assessments at multiple time points.
4. Analyze cognitive outcomes using simple, child-friendly developmental tests and motor milestones.
5. Control for confounders like medical complications, socioeconomic status, and comorbidities.
6. Interpret results and explore patterns across subgroups (e.g., gestational age, birth weight).
7. Discuss limitations and practical implications for clinical practice.

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Expected Outcome

The project is expected to clarify whether early nutrition interventions are associated with improved cognitive and motor development in preterm infants, offer actionable guidance for neonatal feeding practices, and identify areas needing further research.