This thesis study the amniotic fluid abnormalities, the associated fetal congenital anomalies and the fetal maturity. Eighty seven pregnancies with AF abnormalities were examined by 2D US, color Doppler and 4D US . Our results demonstrate that there are different etiologies causing AF abnormalities, however the presence of congenital anomalies was the most common etiology. It also demonstrates statistically significant growth disturbance association as, 39.1% fetuses showed IUGR, 56.3% fetuses showed normal development and 4.6% showed macrosomia. Our study resulted in, the five traditional parameters for prediction of fetal maturity; lung echogenicity compared to the liver echogenicity, colonic hustra, ossification centers, liquor turbidity and placental grading, are highly sensitivite, however, of very low specificity. Our results predict pulmonary hypoplasia at TLV less than or equal to 23.92 , Rt. And Lt. lung length less than or equal to 5.6 and 5.22 cm respectively. We found also a significant positive association between the Rt. Lung Length and TLV, Lt. lung length and TLV, Rt. Lung length and Lt. lung length.