Mothers need additional calories during pregnancy for the natural weight gain. However, the extra calorie needs is not as high as most mothers think. Pregnant women only need to add about 100kcal for the first trimester, add another 200kcal for the second and third trimester. A cup of soy milk supplies your excess calorie needs for the first trimester. While 1 medium banana, 1 apple, 1 cup of soy milk with 1 piece of digestive biscuit in addition to your daily diet provides you nutrients for the excess needs during second and third trimester.