During the first trimester, you should be gaining about one pound per month. If you want to know how your BMI is holding during pregnancy, subtract the weight of pregnancy from your body weight before calculating BMI.
#Healthy body mass index calculator how to#
How to calculate your BMI during pregnancy Even women who gain the lower end of the spectrum will have a BMI that measures in the overweight range at birth.
The BMI change will occur for every pregnant woman. If you are of normal weight when you conceive and you eat healthy, exercise and gain the recommended 25 to 35 pounds, you are having a healthy pregnancy. 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.
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