The aim of the present study was to estimate the effect of breeding season, mother age, fetal sex and gestation period on the birth weigh, placentome diameter (PLD), kidney length (KDL), chest depth (CHD) and abdominal diameter (ABD). A total of 36 ewes were included in this study, the ewes were introduced for breeding in winter and summer. Ultrasongraphic examination was done each two weeks to measure the placentome diameter, abdominal, chest depth and kidney length. The parameters were estimated at 30-50, 60-80, 90-110 and 120 -140 days of gestation period. The lamb birth weight and mother birth weight were recorded just after parturition. Results showed that the male was significantly (p < 0.05) heavier than female lambs (3.82 ± 0.11 vs 3.35 ± 0.07). There was no effect of the breeding season on the mean PLD, CHD, KDL and ABD. The mother age has no effect on lamb birth weight, PLD, CHD, KDL and ABD. The diameters of fetal kidney, placentome, abdomin and chest depth increased with gestation period. The difference was significant (.P<0.05), excepted placentome diameter was non significant. There was no significant effect of fetal sex on the diameter of placentome, fetal chest depth, fetal kidney and fetal abdominal. Conclusion: It was found that the season of breeding had no significant effected on the studied parameters, except the birth weight and abdominal diameter. So it could be advised to bred the animals all over the year