A term newborn weighs 2,100 g (below the 10th percentile), while length and head circumference are at the 40th percentile. The mother had preeclampsia that worsened during the third trimester. Which description best fits this infant's growth pattern?
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Answer: C
Symmetric growth restriction from an early congenital viral infection: Early insults such as congenital infection or chromosomal disorders reduce weight, length and head size in proportion (symmetric), which is not the case here.
Large for gestational age from maternal hyperglycemia and fetal hyperinsulinemia: A weight below the 10th percentile is small, not large, for gestational age.
Asymmetric growth restriction from late uteroplacental insufficiency: Correct. Late placental insufficiency (as with preeclampsia) mainly limits weight, while length and head growth are relatively spared (head-sparing).
Appropriate growth for gestational age with a normal constitutional variant: A birth weight below the 10th percentile with a clear maternal cause is growth restriction, not AGA.
Asymmetric IUGR (weight low, head spared) points to a late placental cause; symmetric IUGR points to an early intrinsic cause such as infection or aneuploidy.