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An error that is commonly made is to change a patient's due date on the basis of a third-trimester ultrasonogram. IUGR is usually classified as symmetric and asymmetric.
Symmetric growth restriction implies a fetus whose entire body is proportionally small.
The maternal-placental-fetal units act in harmony to provide the needs of the fetus while supporting the physiologic changes of the mother.The most widely used definition of IUGR is a fetus whose estimated weight is below the 10th percentile for its gestational age and whose abdominal circumference is below the 2.5th percentile.At term, the cutoff birth weight for IUGR is 2,500 g (5 lb, 8 oz).Limitation of growth potential in the fetus is analogous to failure to thrive in the infant.The causes of both can be intrinsic or environmental.