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Objective: To assess the prevalence and impact of overweight and obesity in an Australian obstetric population.

Design, setting and participants: The Mater Mother's Hospital (MMH), South Brisbane, is an urban tertiary referral maternity hospital. We reviewed data for the 18 401 women who were booked for antenatal care at the MMH, delivered between January 1998 and December 2002, and had a singleton pregnancy. Of those women, 14 230 had an estimated pre‐pregnancy body mass index (BMI) noted in their record; 2978 women with BMI ≤ 20 kg/m² were excluded from further study; the remaining 11 252 women were divided into four categories: “normal” (BMI 20.01–25 kg/m²), “overweight” (BMI 25.01–30 kg/m²), “obese” (BMI 30.01–40 kg/m²) and “morbidly obese” (BMI > 40 kg/m²).

Main outcome measures: Prevalence of overweight and obesity in an obstetric population; maternal …