Pregnancy weight gain is determined by the pre-pregnancy weight, if the pre-pregnancy body mass index is relatively high more than 30 pounds, the weight gain during the entire pregnancy should be controlled within 10 pounds, if the body mass index is between 25-30, the weight gain should be in about 20 pounds. If the weight is more standard, the body mass index is between 18.5-23.9, then the weight gain is controlled again about 30 pounds, can not exceed 40 pounds, if the weight gain is too much, easy to get gestational hypertension or gestational diabetes, pre-eclampsia.