Obese women should limit weight gain to between 11 and 20 pounds during gestation, according to an updated set of pregnancy weight gain guidelines released Thursday by the Institute of Medicine. Previously, the Institute did not recommend a specific gestational weight gain range for obese women, but the section was added in response to increasing obesity rates and high weight gain trends in pregnant women. This is the first time the Institute has issued new pregnancy weight gain guidelines in nearly 20 years.

The Institute of Medicine also reevaluated the weight gain recommendations for overweight, normal weight, and underweight women, though the alterations in these weight groups were minute. The Institute now suggests overweight women gain between 15 and 25 pounds, normal weight women gain 25 to 35 pounds, and underweight women gain 28 to 40 pounds during gestation.

These guidelines are based on multiple factors affecting the health of the mother and embryo. Most central to the Institute’s recommendations is the body mass index (BMI) of the expectant mother, a measurement based on acceptable weight to height ratios. Women with a BMI of 30 or greater are considered obese, while a BMI of 25 to 29.9 is considered overweight. Normal weight women have BMIs between 18.5 and 24.9 and a BMI below 18.5 falls in the underweight range.

To measure your BMI, visit the National Institute of Health’s body mass index calculator.

Test your pregnancy knowledge on the Healia Pregnancy Quiz and challenge yourself on the Weight Management Quiz. After taking the quizzes, visit the Healia Pregnancy Health Guide for more pregnancy information and check out the Healia Obesity and Overweight Health Guide to learn more about weight gain.

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