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-to-be (BMI 25.1-29.9), the weight gain should between 7-11.5kg. For those who are obese, the weight gain should be less than 7kg. Avoid sudden and excessive weight gain as these are associated with adverse health effects such as pregnancy induced hypertension, gestational diabetes and complications during delivery.