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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.
Prepregnancy
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
Amniotic fluid
Placenta
1.5 pounds