Take your prenatal vitamins, which should include folic acid (400 micrograms) daily. You also need Omega 3- fatty acids daily. Some prenatal vitamins have started to include this. A pregnant woman needs 1200 - 1500 mg of Calcium daily. You can either get it from dairy products in your diet or by adding supplementation like OSCAL or Vita Chews or Tums.
If you have a history of a child with a neural tube defect than increase the amount of folic acid to 4 milligrams daily.
Do not smoke, drink alcohol or use recreational drugs.
Avoid high temperatures over 100 degrees (no hot tubs or Jacuzzis).
Drink plenty of water when exercising. Keep your heart rate below 120 beats per minute.
Do not eat raw meat or eat soft, non-pasteurized cheeses.
If you have a cat, do not change the kitty litter (risk for toxoplasmosis).
Do not eat high mercury containing fish: shark, swordfish, king mackerel, and tilefish. Limit servings of fish to 2 meals per week. If you are eating albacore tuna then limit servings to once per week.