Table 1.
Gestational weight gain recommendations based on the 1990 and 2009 Institute of Medicine guidelines [5, 79].
| IOM 1990 | IOM 2009 | |||
|---|---|---|---|---|
| Pre-pregnancy BMI category | Recommendedb range of total weight gain | Pre-pregnancy BMI category | Meana rate of weight gain in the 2nd and 3rd trimester | Recommendedb range of total weight gain |
| BMI < 19.8 kg/m2 (low) | 12.5–18.0 kg | BMI < 18.5 kg/m2 underweight | 0.5 kg/week | 12.5–18.0 kg |
| BMI 19.8–26.0 kg/m2 (normal) | 11.5–16.0 kg | BMI 18.5–24.9 kg/m2 normal weight | 0.4 kg/week | 11.5–16 kg |
| BMI 26.1–29.0 kg/m2 (high) | 7.0–11.5 kg | BMI 25.0–29.9 kg/m2 overweight | 0.3 kg/week | 7.0–11.5 kg |
| BMI > 29.0 kg/m2 (obese) | at least 6.0 kg | BMI ≥ 30c kg/m2 obese | 0.2 kg/week | 5.0–9.0 kg |
aRounded values.
bCalculations assume a total of 0.5–2.0 kg weight gain in the first trimester.
cA narrower range of weight gain may be advised for women with a pre-pregnancy BMI of 35.0 kg/m2 or greater. Individualized advice is recommended for these women.