| Prepregnancy BMI | Recommendations for GWG 3 | Conversion to recommended ranges based on proportions | ||||
|---|---|---|---|---|---|---|
| Category | BMI (kg/m2) | Total first‐trimester (<13 weeks; kg) | Rate of second‐ and third‐trimester GWG (kg/week) | Total at 40 weeks (kg) | Expected GWG (40 weeks) | Range of proportion of GWG |
| Underweight | <18.5 | 2.0 | 0.51 | 12.5–18.0 | 15.77 | 0.79–1.14 |
| Normal weight | 18.5–24.9 | 2.0 | 0.42 | 11.5–16.0 | 13.34 | 0.86–1.20 |
| Overweight | 25–29.9 | 1.0 | 0.28 | 7.0–11.5 | 8.56 | 0.81–1.34 |
| Obese | ≥30 | 0.5 | 0.22 | 5.0–9.0 | 6.44 | 0.78–1.41 |
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