The amount of weight you need to gain during pregnancy depends upon how much you weighed before you became pregnant. According to the American College of Obstetricians and Gynecologists (ACOG) women who have a normal weight before getting pregnant should gain 25 to 35 pounds. Women who are underweight before pregnancy should gain 28 to 40 pounds. And women who are overweight should gain 15 to 25 pounds.
Research shows that women who gain more than the recommended amount during pregnancy have a higher chance of being obese 10 years later. Ask your doctor how much weight gain during pregnancy is healthy for you.