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Japan's Ministry of Health, Labour and Welfare recommends a gain of 9 to 12 kilograms (about 20 to 26 pounds) for underweight women (body mass index 18.5 or less) and 7 to 12 kilograms (about 15 to 26 pounds) for normal-weight women (BMI 18.6 to less than 25). Overweight women (BMI 25 to 30) need to add 7 kilograms or less (about 15 pounds), while obese women (BMI greater than 30) should gain only 5 kilograms or less (about 11 pounds).

US guidelines from the Institute of Medicine recommend that underweight women gain 28 to 40 pounds during pregnancy (12.5 to 18 kilograms); normal-weight women gain 25 to 35 pounds (11.5 to 16 kilograms); overweight women gain 15 to 25 pounds (7 to 11.5 kilograms); and obese women gain 11 to 20 pounds (5 to 9 kilograms).

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