During your second and third trimesters of pregnancy, you need more calories each day to support the growth of your baby. For most women, this means an extra two or three Food Guide servings daily. You can add them in as an additional snack or as part of your usual meals. For example, have a fruit and yogurt as a snack, or have an extra slice of toast at breakfast and an extra glass of milk at supper, and Avoid the following foods which may be contaminated by bacteria.