Preeclampsia-eclampsia still continues to be one of the major causes of maternal and fetal mortality and morbidity. Recent evidence suggests that there may be several underlying causes or predispositions leading to develop this syndrome, which not only affects the mother but significantly affects the fetal growth and development.The objective of the study was to assess the difference in birth weight in pregnancy with and without preeclampsia . A case – control study at Al-kadhmya teaching hospital The study included 200 pregnant women with singleton viable gestation presented in labor who were admitted to hospital.A comparison of 100 women in the preeclamptic group and 100 women in the non-preeclamptic group in terms of maternal age, parity, gestational age at delivery, placental weight, and fetal birth weight and sex. Detailed obstetric and general medical history was taken and general and obstetric examination performed. The newborn infants were carefully examined and weighed, and the APGAR score was assessed after delivery. The fresh placenta was examined and then weighed with the membranes and cord attached.At low placental weight, preeclampsia had significant association with low birth weight (35%). However, at high placental weight, preeclampsia had non-significant association with high birth weight (4%). Birth weight of neonatal case group was close to birth weight of control group especially at late onset of preeclampsia but this was not significant statistically .Preeclampsia is multisystemic disorder and it is (the disease of theories) these result suggest that preeclampsia may represent different entities with different degree of placental involvement and different degree of fetal growth and development.