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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






Total gain   


Rate of gain in 2nd and 3rd      



 less than 18.5

 28-40 lbs

 1 (1-1.3) lbs/week

Normal Weight


 25-35 lbs

 1 (0.8-1) lbs/week



 15-25 lbs

 0.6 (0.5-0.7) lbs/week


 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:


7.5 pounds

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

7 pounds

Fluid volume

4 pounds

Breast enlargement

2 pounds


2 pounds

Amniotic fluid

2 pounds


1.5 pounds


3 pounds

Online Medical Reviewer: Dozier, Tennille, RN, BSN, RDMS
Online Medical Reviewer: newMentor board-certified, academically affiliated clinician
Date Last Reviewed: 5/27/2013
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