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Definition of Small for gestational age (SGA)
Medically reviewed by Min Clinic Staff | Updated: January 2026
Small for gestational age (SGA): SGA infants weigh 2500 g or less at birth and are considered to have intrauterine growth retardation (IUGR), given their gestational age. By contrast, an infant may weighs 2500 g or less simply because of prematurity.