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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

 

 

Prepregnancy

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 pounds

Maternal energy stores
(fat, protein, and other nutrients)

7 pounds

Fluid volume

4 pounds

Breast enlargement

2 pounds

Uterus

2 pounds

Amniotic fluid

2 pounds

Placenta

1.5 pounds

Blood

3 pounds