Weight Gain During Pregnancy

Weight gain during pregnancy varies from woman to woman and depends on body type. Each woman should talk with her care provider about the appropriate amount of weight gain, as well as diet and exercise.

2009 Recommendations for Pregnancy Weight Gain by BMI (Body Mass Index) from the Institute of Medicine

Pre Pregnancy
BMI
BMI Total Gain
Range
Rate of Gain in 2nd and 3rd
Trimester
Underweight less than 18.5 28-40 lbs. 1 (1-1.3) lbs./week 
Normal Weight 18.5-24.9 25-35 lbs. 1 (0.8-1) lbs./week 
Overweight 25.0-29.9 15-25 lbs. 0.6 (0.5-0.7) lbs./week 
Obese greater than 30.0 11-20 lbs. 0.5 (0.4-0.6) lbs./week

Total weight gain at the end of pregnancy is, in most instances, approximated as follows, according to the March of Dimes:

baby 7.5 lbs.
maternal energy stores
(fat, protein, and other nutrients)
7 lbs.
fluid volume 4 lbs.
breast enlargement 2 lbs.
uterus 2 lbs.
amniotic fluid 2 lbs.
placenta 1.5 lbs.


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