Gaining too much or too little weight during pregnancy can be harmful to you and the baby. Women who gain too much weight or gain weight rapidly are at risk for a miscarriage, a pre-term delivery or a very large baby. These women are also at risk for getting gestational diabetes, high blood pressure, and varicose veins. Women who gain too little weight are at risk for a very low birth weight baby.

Your health care provider can assist you in knowing how much weight is healthy for you to gain. Also the exact amount of calories you need depends upon your weight before you got pregnant. Many women gain a great deal of weight in their first trimester when truly gaining 1 to 5 pounds is more than adequate. After the first trimester you can estimate gaining one pound per week in the second and third trimesters.

If you began pregnancy at a healthy weight
Typically, you should most likely gain 25 to 35 pounds.

If you began pregnancy underweight
You will probably be guided to gain a little more weight, but not too much. A 28-40 pound weight gain is healthy. Underweight women are at risk for giving birth to smaller babies. You may be recommended to gain slightly over a pound a week in the second and third trimesters.

If you began pregnancy overweight
You may be guided to gain 15-25 pounds.

If you were obese at the start of your pregnancy
You may be recommended to gain 11-20 pounds and aim for gaining slightly under 1 pound every week in the second and third trimesters.

If you’re expecting twins
It typically is recommended to gain between 35-55 pounds. Of course it is slightly adjusted for women who are either underweight or overweight.

Putting on weight slowly and steadily is healthiest.

Try not to worry if you gain less than four pounds in the first trimester, and make up for it later, or if you gain more than 5 pounds in the first trimester and a little less later. Everyone is different. The goal is to stay aware of your weight gain and to speak to a health care provider if you feel concerned about it.