How can a pregnant woman's sti affect her unborn fetus?

For a project i need to provide a description of food (ex. salad, pizza). my last two braincells and i can't think of a food to choose so i'm asking the people of to me out - can't be a healthy food (no fruits, vegetables) - can be junk food except pizza if you could provide a description of the food you chose that would be awesome! : d