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Eating the right number of calories lets you and your baby gain the proper amount of weight. During the first 3 months of your pregnancy, you do not need to change the number of calories you are eating. Normal-weight women need an extra 300 calories each day during the last 6 months of pregnancy. This totals about 1,900 to 2,500 calories a day. If you were underweight, overweight, or obese before you became pregnant, or if you are pregnant with more than one baby, you may need a different number of calories.
For the first six months of your pregnancy (first and second trimesters), you won't need to have more calories than you did before you became pregnant. That's about 2,000 calories a day.However, during the last three months of your pregnancy (third trimester) , you will need an extra 200 calories a day, making a total of about 2,200 calories a day. Bear in mind that we're all different shapes and sizes, and some of us are more active than others.ou are supposed to gain 20-30 pounds with a single baby during pregnancy. 20 lbs is 70,000 calories. Only having 200 calories more a day only for the last trimester is only 16,800 calories. That's only 4.8 pounds of weight gain which is not enough.