Table 2 Weight classification/WHO 17, with modified criteria of the Canadian guidelines 13 and recommended weight gain according to the Institute of Medicine (IOM) 19, commented by Rasmussen 18, 40.
| Criteria | BMI (kg/m2) | Recommended weight gain | ||
|---|---|---|---|---|
| Course of pregnancy | 2nd and 3rd trimester | |||
| Singleton pregnancy | Twin pregnancy | Singleton pregnancy | ||
| Underweight | < 18,5 | 12.5–18 kg | no information | 0.51 (0.44–0.58) kg/gestational week |
| Normal weight | 18.5–24.9 | 11.5–16 kg | 17–25 kg | 0.42 (0.35–0.50) kg/gestational week |
| Overweight | 25–29.9 | 7–11.5 kg | 14–23 kg | 0.28 (0.23–0.33) kg/gestational week |
| Obesity class I | 30–34.9 | 5–9 kg | 11–19 kg | 0.22 (0.17–0.27) kg/gestational week |
| Obesity class II | 35–39.9 | 5–9 kg | 11–19 kg | 0.22 (0.17–0.27) kg/gestational week |
| Obesity class III | > 40 | 5–9 kg | 11–19 kg | 0.22 (0.17–0.27) kg/gestational week |