The Institute of Medicine (IOM) has revised the guidelines for weight gain during pregnancy. The new guidelines take into account the woman’s body mass index (BMI). The higher the woman's BMI, the less she should gain during the pregnancy.
BMI in kg per square meter
Weight Gain in pounds
Weight Gain in kilograms
Weekly Change in pounds
Weekly Change in kilograms
< 18.5
28 to 40
12.73 to 18.18
1.0 to 1.3
0.45 to 0.59
18.5 to 24.9
25 to 35
11.36 to 15.91
0.8 to 1.0
0.36 to 0.45
25.0 to 29.9
15 to 25
6.82 to 11.36
0.5 to 0.7
0.23 to 0.32
>= 30
11 to 20
5.0 to 9.09
0.4 to 0.6
0.18 to 0.27
Outcomes were better if women stayed within the weight gain ranges.
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