Recommended gain for twin pregnancies by BMI.
IOM 2009 guidelines for twins: Normal BMI: 16.8–24.5 kg. Overweight: 14.1–22.7 kg. Obese: 11.3–19.1 kg. Twin pregnancies require more calories (+300 kcal/day per fetus) and higher protein intake. Optimal gain by 24 weeks is associated with better birth weights.