Background: The placenta is an essential fetal organ that acts as a physiological link between a pregnant woman and her infant, secreting hormones and acting as a barrier against infection. Objectives: The placental thickness at the umbilical cord insertion site in primigravida and multipara were measured sonographically. The results were compared to the gestational age, which was calculated by the last menstrual period (LMP) and other fetal growth parameters, like biparietal diameter (BPD), abdominal circumference (AC), and femur length (FL). Patients and Methods: This prospective investigation has been carried out on 200 pregnant women at Menoufia University Hospital and Menouf General Hospital included singleton pregnancy and those in the 2^nd or 3^rd trimester. Results: At gestational age from 31-40 weeks, there was a significant relation among age of pregnancy and placental thickness, BPD (week), BPD (mm), HC (week), HC (mm), FL (week), FL (mm), AC (week), and AC (mm), P-value less than 0.05. There was insignificant variance among the primigravida and multipara groups in terms of placental thickness, BPD, HC, FL, AC, and other factors (p>0.05). Conclusion: We conclude that there was insignificant variance in placental thickness, BPD, HC, FL, and AC between primigravida and multigravida. However, gestational age significantly influenced these factors, with increased thickness observed in gestational age between 31-40 weeks, indicating that gestational age significantly influences placental thickness and other factors.