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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 instance, in the first trimester, a pregnant woman does not need any extra calories at all. In the second trimester, you should try for an additional 340 calories a day to support your baby's development. During your last trimester of pregnancy, an optimum caloric intake would be increase to the 450 calorie range. This would equate roughly to eating a serving of lowfat Greek yogurt (120 Calories), two pieces of whole wheat toast (150 calories), and about 25 almonds (173 Calories).