Good for you for taking your prenatals!
Your most important vitamins right now are folic acid and iron.  Folic acid,
as you probably know, was good in those first few weeks of pregnancy for
reducing birth defects.  Iron is good throughout your pregnancy to prevent
anemia.  Calcium indeed is needed to prevent your own bone loss.  Look
for a vitamin that contains the following:

4,000 IU of vitamin A
1,000 mcg (1 mg) of folic acid
100 mg of vitamin C
400 IU of vitamin D
300 mg of calcium
1.5 mg of thiamine
1.6 mg of riboflavin
2.6 mg of pyridoxine
17 mg of niacinamide
2.2 mcg of vitamin B-12
10 mg of vitamin E
15 mg of zinc
45 mg of iron


Vitamins that are not coated are better absorbed by your digestive system.  
Much of what is in your vitamin is not absorbed and wasted through your
urnine.  Vitamins should never take the place of a diet rich in vitamins and
minerals!
Raw fruits and vegetables still contain all of their natural nutrients that have
not yet been destroyed by the cooking or preserving process.  Make them
the bulk of your diet.
Cascade Christian Childbirth Association
    Prenatal Vitamins
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Disclaimer

The suggestions contained in this website are
not intended to replace medical advice.  If you
feel you are experiencing a situation that
requires medical attention, contact your care
provider.