Recommendations for total weight gain range in singleton pregnancies by pre-pregnancy body mass index (BMI) (Institute of Medicine)89
| Pre-pregnancy BMI (kg/m2) | Total weight gain (lbs) | Total weight gain (kg) | Weekly weight gain range in the second and third trimester, lbs (kg) | |
|---|---|---|---|---|
| <18.5 | Underweight | 28–40 | 12.5–18.0 | 1.0–1.3 (0.44–0.58) |
| 18.5–24.9 | Normal weight | 25–35 | 11.5–16.0 | 0.8–1.0 (0.35–0.50) |
| 25.0–29.9 | Overweight | 15–25 | 7.0–11.5 | 0.5–0.7 (0.23–0.33) |
| >30.0* | Obese | 11–20 | 5.0–9.0 | 0.4–0.6 (0.17–0.27) |
*Includes class I (30-34.9), II (35-39.9) and III (>40).