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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.
During pregnancy, the American Pregnancy Association recommends an additional 300 calories per day during the second and third trimesters. This calculator is just an estimate. If you are gaining weight too quickly, simply lower your calorie intake by 50-100 calories per day for one week at a time. Alternatively, if you are not gaining enough weight, you can add in 50-100 calories per day.