Institute of Medicine 2009 Pregnancy Weight Gain Guidelines3
| Recommendation by Prepregnancy BMI | Total Weight Gain (Kg) | Total Weight Gain (lbs) | 2nd and 3rd Trimester (lbs/week) | 2nd and 3rd Trimester (lbs/month) |
|---|---|---|---|---|
| Underweight: <18.5 | 13 to 18 | 28 to 40 | 1 to 1.3 | 4 to 6 |
| Normal: 18.5 to 24.9 | 11 to 16 | 25 to 35 | 0.8 to 1.0 | 4 |
| Overweight: 25 to 29.9 | 7 to 11 | 15 to 25 | 0.5 to 0.7 | 2 |
| Obese: ≥30 | 5 to 9 | 11 to 20 | 0.4 to 0.5 | 1.5 to 2 |
BMI, body mass index.