Adverse Perinatal Outcomes Associated with Increasing Maternal Obesity.

Objective: The aim of this study was to determine adverse perinatal outcomes related to maternal preconception body mass index (BMI).

Study Design: This is a retrospective observational cohort study at a single institution of 500 consecutive mothers of normal weight with a preconception BMI of 18.5 to less than 25 and 500 additional obese mothers with a preconception BMI more than or equal to 30.