There is little formal research or even mention of pregnancy BMI, other than information for women who are overweight or obese (and underweight) prior to pregnancy. Does the obese BMI during pregnancy increase health risks?įor most women, the majority of weight gain occurs in the third trimester when the baby is growing by leaps and bounds. She did nothing wrong, ate all healthy foods and gained the right amount of weight, but the numbers say she is now obese. If she gained all 35 pounds she would move from a normal to obese, in terms of BMI. Acceptable weight gain for this patient would be up to 35 pounds. If you look at basic numbers, a woman who is 64 inches tall weighing 140 pounds is considered to be a normal weight with a healthy BMI. Much of the science on the matter is clear – women who are overweight or obese when they become pregnant are in the highest risk category, but what about women who start out the pregnancy in the normal BMI range, but end the pregnancy in the obese range?Ĭan a woman move from normal weight to obese in a healthy pregnancy? Pregnancy complications associated with pre-pregnancy obesity may include increased risk of C-section and excessive fetal weight gain. Research studies have proven obesity is a major concern during pregnancy. If you are very young, then more weight gain is probably needed as teenagers may still be growing themselves.If you were obese before pregnancy (for the IOM, that is a BMI of over 29.9) about 11 to 20 pounds or between 5 and 9 kg extra weight during pregnancy. If you were overweight before pregnancy (for the IOM, that is a BMI between 25 and 29.9): between about 15 to 25 pounds or 7 and 11.5 kg extra weight during pregnancy.If you were normal weight before pregnancy (for the IOM, that is a BMI between 18.5 and 24.9): between about 25 to 35 pounds or 11.5 and 16 kg extra weight during pregnancy.If you were underweight before pregnancy (for the IOM, that is a BMI of less than 18.5): between about 28 to 40 pounds or 12.5 and 18 kgs extra weight during pregnancy.Then just reference that number with this chart.The Institute of Medicine (IOM) recommended weight gain is as follows: (source: CDC) How is BMI calculated?įormula: x 703Ĭalculate BMI by dividing weight in pounds (lbs) by height in inches (in) twice and multiplying by a conversion factor of 703.Įxample: Weight = 150 lbs, Height = 5’5″ (65″)Ĭalculation: x 703 = 24.96īelow this chart at the bottom of the page is a quick BMI Calculator from the CDC you can use too. Furthermore, BMI appears to be as strongly correlated with various metabolic and disease outcome as are these more direct measures of body fatness. BMI, however, does not take in consideration age, gender, nor is it a completely accurate measurement for persons with extraordinarily high or low levels of lean muscle mass.īMI does not measure body fat directly, but is moderately correlated with more direct measures of body fat. The four main categories are: Underweight, Normal Weight, Overweight, and Obesity. Customary Measurements What is Body Mass Index?īMI is a screening method for measuring and categorizing weight for adults and is the most commonly used method for estimating body fat levels.
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