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Extracted from Survival Guide to Midwifery, 2nd Edition (2012) Diane M. Fraser and Margaret A. Cooper, Oxford; Churchill Livingstone: 2012. Courtesy Elsevier
Average weight gain during pregnancy is about 12.5kg; however, this varies according to the woman's pre-pregnancy body mass index (BMI) (weight/height in metres squared). Those with a low BMI are expected to gain more weight, whereas women who are obese should gain less.
Category Pre-pregnant BMI (kg/m2)
Low (underweight) <18.5
High (overweight) 25.0-29.9