 [ Symptoms ] how much weight should i gain during pregnancy [ Disease ] pregnancy does not equal a get out of jail free card for a caloric spending spree if you gain too much weight you are at risk for conditions like gestational diabetes too little and your baby may be born at a low birth weight what is just right for you if you are at a normal weight before pregnancy gain between 25 to 35 pounds during pregnancy if you are overweight before pregnancy gain 15 to 25 pounds if you are underweight prior to pregnancy gain 28 to 40 pounds for multiple births consult your doctor usually you should gain about 35 to 45 pounds for twins the average woman should gain about 2 to 4 pounds during her first three months of pregnancy and 1 pound a week for the remainder of her pregnancy