What is the expected weight gain during pregnancy?

For women of normal weight before pregnancy, the weight gain during pregnancy should be about 11-16 kg. Underweight women would need to gain about 13-18 kg. If a woman was overweight before pregnancy, she should gain at least 6-7 kg, but not more than 12 kg during pregnancy. If you are pregnant with twins, the normal expected weight gain during pregnancy would be about 13-18 kg.