Table 1.

Gestational weight gain recommended by the Institute of Medicine guideline

Prepregnancy BMI (WHO)		First trimester GWG range	Second & third trimester rate of GWG	Range of GWG before OGTT †
Underweight	<18.5 kg/m2	0.5–2.0 kg	0.51 (0.44–0.58) kg/week	0.5 + (w‐13) × 0.44–2.0 + (w‐13) × 0.58 kg
Normal	18.5–24.9 kg/m2	0.5–2.0 kg	0.42 (0.35–0.50) kg/week	0.5 + (w‐13) × 0.35–2.0 + (w‐13) × 0.50 kg
Overweight	25.0–29.9 kg/m2	0.5–2.0 kg	0.28 (0.23–0.33) kg/week	0.5 + (w‐13) × 0.23–2.0 + (w‐13) × 0.33 kg

^†Gestational week during which gestational weight was recorded during the prenatal care visit nearest within 4 weeks before oral glucose tolerance test (OGTT). BMI, body mass index; GWG, gestational weight gain; w, the gestational week during which gestational weight was measured for calculating GWG before OGTT; WHO, World Health Organization.