A baby's birth weight plays an important role in determining its survival. Neonatal morbidity may be exacerbated by an unusual birth weight during delivery and afterward. Accurate birth weight measurement is crucial for managing labor and determining delivery method. So the present longitudinal study was done on 120 pregnant women planned for full term delivery either by elective caesarean section or by induction of labor, Mothers with live singleton fetus were included in the study to estimate fetal weight in utero by clinical methods and ultrasonography at term pregnancy vs exact weight of the baby after delivery. The study revealed that in most cases, clinical birth weight measurements are as accurate as ultra-sonographic estimates, except in the case of low-birth-weight infants. In order to provide a better prognosis and further assess the fetal well-being, additional sonographic estimation is recommended when the clinical approach indicates a weight less than 2,500 g.