Abstract
Prenatal events have important implications for health in childhood and adult life. Newborns whose birth weights are low for their gestational age are at much greater risk for a wide range of problems: in the perinatal period, stillbirth, asphyxia during delivery, and neonatal complications1; in childhood, impaired neurologic development2 and cerebral palsy3; and in adulthood, non-insulin-dependent diabetes mellitus, hypertension, and cardiovascular disease4. Some of the mystery of fetal life has been dispelled during the past two to three decades by the use of three techniques. Ultrasound imaging makes it possible to observe fetal structure (to detect malformations) . . .