Pregnancy Weight Gain
Recommended weight gain during pregnancy based on pre-pregnancy BMI (IOM 2009).
Inputs
Gain
IOM 2009 ranges (lb)
Underweight (BMI < 18.5)
28–40 lb
Normal (18.5–24.9)
25–35 lb
Overweight (25–29.9)
15–25 lb
Obese (≥ 30)
11–20 lb
Twins
Add ~10–15 lb to the range
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