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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.
The rule of thumb is most women need about 300 extra calories every day during the last five to six months of pregnancy for good fetal development. This will combine to a healthy weight gain of about one pound each week. If you consume too few calories your body may begin to take the calories from stores that are needed for healthy pregnancy weigh gain and baby development. Replenish the calories you burn by doing moderately intense cardio exercise every week.