On average, a healthy amount of weight gain during pregnancy is 25 to 35 pounds (11.3-15.9 kilograms). This is usually reached by gaining 1 to 4 pounds (0.4 to 1.8 kilograms) during the first trimester, and about 2 to 4 pounds (.9-1.8 kilograms) each month from 4 months until delivery.

Where does this weight come from? According to the Nemours Foundation, this is how a 30 pound (13.6 kilogram) pregnancy weight gain is typically distributed:

• 7.5 pounds (3.4 kilograms): your baby’s weight
• 1.5 pounds (.6 kilograms): the placenta
• 2 pounds (.9 kilograms): enlargement of your uterus
• 2 pounds (.9 kilograms): amniotic fluid surrounding your baby
• 2 pounds (.9 kilograms): breast enlargement
• 4 pounds (1.8 kilograms): your extra blood
• 7 pounds (3.17 kilograms): your extra stored nutrients
• 4 pounds (1.8 kilograms): your extra body fluids

Pregnant Woman © Nucleus Medical Media, Inc.

Keep in mind that pregnancy weight gain may vary.

• If you are underweight, you should gain 28-40 pounds (12.7-18.14 kilograms).
• If you are overweight, you should gain 15-25 pounds (6.8-11.33 kilograms).
• If you are obese, you should gain 11-20 pounds (4.9-9.07 kilograms).
• If you are having multiples (twins, triplets), you will gain more weight, so talk to your doctor about the amount of weight gain that will be best for you.

Work with your care team to find the right weight range for you. Balanced weight gain can help you feel better during pregnancy. It may decrease constipation and back pain. Healthy weight gain can also help during labor and delivery. Too much weight gain may increase the risk of complications such as diabetes or high blood pressure. Low weight gain may also mean the baby is not getting enough nutrients. Your care team can help to plan ways to reach weight goals during pregnancy.