Growth Trajectories Following Early Nutritional Intervention in Small-for-Gestational-Age Infants

Abstract

Infants born small for gestational age (SGA) present clinicians with two competing priorities: promoting sufficient catch-up growth to support neurodevelopment and adult stature, while avoiding the rapid, fat-predominant weight gain that developmental-origins research links to later insulin resistance and cardiometabolic risk. This article synthesizes the literature on postnatal nutritional intervention and growth trajectories in SGA infants, tracing the question from the definition and placental etiology of SGA birth, through the foundational developmental-origins and thrifty-phenotype evidence that first raised concern about the composition and tempo of catch-up growth, to the direct randomized-trial evidence on nutrient-enriched feeding in term SGA and postdischarge preterm infants. We give particular weight to cohort data linking catch-up growth patterns to measurable differences in body composition and metabolic markers in childhood, and to the neurodevelopmental and endocrine literature, including growth hormone therapy, bearing on children whose catch-up growth fails to materialize. Read together, the evidence supports nutrient-enriched feeding strategies that favor linear and head-circumference growth without disproportionate weight gain as a reasonable approach to threading this needle, while leaving an up-to-date, etiology-stratified, body-composition-informed trial base as a genuine and consequential gap in an evidence base still substantially anchored in trials from the 1990s and 2000s.