Weight gain during pregnancy should be gradual with the most weight being gained in the last trimester. According to the ACOG, you should gain about 2 to 4 pounds during the first three months of pregnancy and then 3 to 4 pounds per month for the rest of your pregnancy. Total weight gain should be about 25 to 30 pounds. This will decrease the risk of delivering a low-birth-weight baby. The Institute of Medicine recommends that women who have a low Body Mass Index (BMI) — the ration of weight to height — should gain 28 to 40 pounds during pregnancy and women who have a higher BMI should gain 15 to 25 pounds. Check with your doctor to determine how much weight gain during pregnancy is healthy for you.
Weight gained includes 6 to 8 pounds for the weight of the baby. The remaining weight consists of a higher fluid volume, larger breasts, larger uterus, amniotic fluid, and the placenta. Make sure to visit your doctor throughout your pregnancy for an assessment of your weight gain. Your doctor can make recommendations about how much weight you should be gaining to ensure that your pregnancy is progressing smoothly and that you are getting the right amount of nutrients.