Lean cuts of meat, fruits ,veggies and lots of water. Of course you need to avoid alcohol, cigarettes, drugs (duh) but you need to watch your fish intake because of mercury. Now is not the time to experiment with new supplements or try some exotic raw meats ,just stick with the stuff you know and you'll be fine. Oh yea your doctor probably already prescribed this for you( I mean the pregnant woman) but a prenatal vitamin will help more than you know. Another good idea ,go organic. There's not much more that you need, if she decides to exercise ( helps make the birth easier) I would consult your doctor. Good luck and congrats.