The American College of Ob/Gyn makes the following suggestions during pregnancy:: Add 100-300 cal/day to your diet (300 calories is equivalent to a small snack-for example, ½ peanut butter and jelly sandwich and 1 glass low fat milk) Daily amount of Grains - 6 ounces Vegetables - 2 ½ cups Fruit - 1 ½ -Leer Más.