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Normal weight gain is calculated using your body mass index (BMI) before pregnancy. If you are underweight before you become pregnant (have a BMI of les than 19.8) your recommended weight gain is between 12.5kg and 18kg (28 to 40lb). If you have an average BMI (19.8 to 26) before pregnancy you should gain between 11.5kg and 16kg (25 to 35lb). If you are overweight before getting pregnant (have a BMI above 26) you should gain between 7kg and 11.5kg (15 to 25lb).