Weight gain during pregnancy varies among women. If you are underweight (BMI <18.5), you should gain 12.5-18kg. If your weight is normal (BMI 18.5-25), the recommended weight gain is 11.5-16kg. For overweight mother (BMI 25.1-29.9), weight gain should between 7-11.5kg. For those who are obese, weight gain is should be <7kg. Avoid sudden and excess weight gain as these are associated with adverse health effects: pregnancy induced hypertension, gestational diabetes, large baby who may become obese, and complications during delivery.