Objective: To study and compare multiple maternal and neonatal outcomes as well as weight gain throughout pregnancy among obese and lean pregnant women. Patients and methods: This cohort study was held in the Department of Obstetrics and Gynecology in Benha University Hospitals between January 2015 and July 2016. 2000 pregnant women were enrolled in the study and divided into two groups according to their BMI at early pregnancy to compare their past obstetric performance and current pregnancy outcomes. Collected data were analyzed appropriately to achieve the pre-determined study outcomes. Results: Obese pregnant women had a higher incidence of past obstetric history of abortion (p