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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.
Determine the amount of calories you should eat by using the number of calories you used to eat to maintain your weight prior to your pregnancy and then add an extra 100 calories to support your pregnancy. For most women, 2,300 to 2,500 calories a day is a good range to aim for during the first trimester. It is normal for pregnant women in their second or third trimester to be hungrier because their baby needs more fuel to develop at this stage.