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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

Normal                              18.5-24.9

High (overweight)              25.0-29.9

Obese                               >29.9

 

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