Intrauterine growth restriction (IUGR) is defined as the inability of the fetus to fulfill its genetic growth potential. "Small for gestational age" (SGA) is the most commonly used indicator for diagnosing IUGR. However, this definition does not consider intrauterine growth trajectory or physical characteristics at birth. SGA is based on the relationship between birth weight and gestational age, and does not address anthropometric measurements at birth or prenatal indicators, such as biometric, biophysical, and Doppler velocimetry abnormalities. SGA infants may constitute intrauterine growth restricted as well as constitutionally small infants. This distinction can be made more accurately by complementary assessment of body composition. The clinical meaning of each group identified by body composition will be assessed by the evolution until 3-months of age. The feeding pattern and composition will be considered a major postnatal exposure. Accurate classification of IUGR profiles is essential to ensure appropriate nutritional intervention.
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Body composition assessment - Fat mass (FM)
Timeframe: Fat mass will be assessed 1 week after discharge, 1 month of age and 3 months of age
Body composition assessment - Fat-free mass (FFM)
Timeframe: Fat-free mass will be assessed 1 week after discharge, 1 month of age and 3 months of age
Body composition assessment - Fat mass index (FMI)
Timeframe: Fat mass index will be calculated 1 week after discharge, 1 month of age and 3 months of age
Body composition assessment - Adiposity (%FM)
Timeframe: Adiposity will be assessed 1 week after discharge, 1 month of age and 3 months of age